Question: What game with Ellie as the main protagonist was announced at the PlayStation Experience event in December 2016?

Context articles: List of Hatoful Boyfriend characters
Ace Combat 7: Skies Unknown
PlayStation Experience
Ellie (The Last of Us)
Teslagrad
BlazBlue: Central Fiction
Extermination (video game)
Gal*Gun: Double Peace
The Last of Us Part II
Dreadnought (video game)

This is a list of characters from the visual novel, web series, and webcomic "Hatoful Boyfriend", and its sequel, "" by PigeoNation Inc. The games take place in the year 2188, and the story follows the main protagonist, a girl who is the only human student at St. PigeoNation's Institute, a high school for gifted birds.
 There are eight love interests in the first game who along with the protagonist make up the main cast of the series: Ryouta Kawara, the protagonist's kindhearted childhood friend; Sakuya Le Bel Shirogane, a haughty exchange student and nobleman from France; Yuuya Sakazaki, a flirtatious but shifty upperclassman; Nageki Fujishiro, a quiet and mysterious freshman; San Oko, an athletic, pudding-obsessed jock; Anghel Higure, the school eccentric; Kazuaki Nanaki, the school's helpful but narcoleptic math professor; and Shuu Iwamine, the creepy, suspicious school doctor.
 The dating simulation portion of "Hatoful Boyfriend" focuses on the protagonist's interactions with each of the love interests and the relationships that result, while the darker "Bad Boys Love" route of the game instead follows Ryouta, attempting to figure out the identity of the protagonist's killer after she is murdered.
 "Holiday Star" takes place in an alternate timeline in which the events of "Bad Boys Love" do not occur, and removes the otome game aspects of the first game in favor of a more linear storyline split into four chapters—the first two chapters are largely comedic, while the latter two chapters take place on the oneiric Holiday Star.
Ace Combat 7: Skies Unknown is an upcoming action arcade flight video game developed and published by Bandai Namco Entertainment for Microsoft Windows, PlayStation 4, and Xbox One.
 It is the first "Ace Combat" game developed for an eighth generation console.
 The PlayStation 4 version will feature exclusive missions for PlayStation VR.
 Two-player local multiplayer will also be featured.
 It was revealed at PlayStation Experience 2015 in December 2015.
 Initially announced only for the PlayStation 4, it was later confirmed to be a multiplatform release in a trailer released in January 2017.
 The game serves as a sequel to "", and uses Unreal Engine 4.
 It was initially announced that the game would be released in 2017, but it has since been delayed to 2018.
PlayStation Experience, also known as PSX, is an annual event for the video game industry presented by Sony Interactive Entertainment used to reveal and advertise PlayStation games and game-related merchandise.
 The event is open to the public, and showcases various panels and many unreleased games, with playable demos.
Ellie is a fictional character in the 2013 video game "The Last of Us", and the main protagonist of the upcoming video game "The Last of Us Part II".
 In the first game, the character Joel is tasked with escorting Ellie across a post-apocalyptic United States in an attempt to create a potential cure for an infection to which Ellie is immune.
 She is voiced by Ashley Johnson, who also provided motion capture for the character.
 While players briefly assume control of Ellie for a portion of the game, the computer's artificial intelligence primarily controls her actions, often assisting in combat by attacking or identifying enemies.
 Ellie reappeared as the sole playable character in the downloadable content prequel campaign, "", in which she spends time with her friend Riley.
 Ellie is also the main character in the comic book prequel, "", wherein she befriends Riley and has her first encounter with the rebel group the Fireflies.
Teslagrad is a 2D side-scrolling puzzle-platform video game developed and published by Rain Games.
 The game was released on Steam on 13 December 2013, on Nintendo eShop for the Wii U on 11 September 2014, and on PlayStation Store for the PlayStation 3 and PlayStation 4 on 3 December 2014 in Europe.
 The North American PSN Store release date for the PlayStation 3 and PlayStation 4 was scheduled on 27 January 2015, but it has been postponed on the day of the release.
 The retail version, published by Soedesco, was released in France, Germany, Italy, and Spain on 3 December 2014, and in UK on 30 January 2015.
 The PlayStation Vita version was announced on 27 February 2014, but since then no exact date was given.
 The game was also released digitally in Japan on 18 February 2015, with an update to the Steam version that added Japanese language.
 An Xbox One version was announced at the end of February 2016 with the release date of 9 March 2016.
 "Teslagrad" uses Unity game engine, making it easier for developers to reach cross platform.
BlazBlue: Central Fiction, released in Japan as BlazBlue: Centralfiction (ブレイブルー セントラルフィクション , BureiBurū: Sentorarufikushon ) is a 2-D fighting video game developed by Arc System Works.
 It is the fourth game to the BlazBlue series, and is set after the events of "".
 It is also the final game of Ragna's story as the main protagonist.
 A location test appeared mid-July.
 It was released for the arcades on November 19, 2015.
 A console version was released in Japan on October 6, 2016, in North America on November 1, 2016, and Europe on November 4th, 2016 for the PlayStation 3 and the PlayStation 4, both physically and digitally.
 It also introduced the playable appearances of Hibiki Kohaku, Naoto Kurogane, Nine the Phantom, Saya/Hades Izanami, Es, Mai Natsume,Susano'o,and Jubei.
 It serves as the conclusion of the Azure Saga that began in "Calamity Trigger".
 The arcade mode stories are separated into three acts.
Extermination（エクスターミネーション）is a survival horror video game for PlayStation 2.
 Since the title was a first-party game and came out very early in the system's life cycle, it was used as a showcase for the system at trade shows before its release.
 The game was considered the first survival horror release on the PlayStation 2 and generated some hype amongst critics, but "Extermination" only received mostly average reviews.
 Former members of the development team joined Access Games.
 There are significant differences between the European and North American versions of the game including a redesign of the main protagonist, and entirely rerecorded dialogue using different voice actors.
Gal*Gun: Double Peace (ぎゃる☆がん だぶるぴーす , Gyaru Gan Daburu Pīsu ) is a rail shooter bishōjo video game developed by Inti Creates.
 The game was released on PlayStation 4 and PlayStation Vita in Japan in August 2015, in Europe in July 2016, and in North America in August 2016.
 It is the sequel to the 2011 game, "Gal*Gun".
 The game's synopsis features the main protagonist named Houdai Kudoki, a 2nd year male student, was shot by cupid angel named Ekoro with unintended overcharged "Pheromone Shot", and the aura caused by the her overcharged shot made all female students from the school fall in love with him and chasing after him as they try to get him as their partner.
 He finds his "True Love" girlfriend of player's choice before the sunset, while fending off the girls on his way, like its predecessor.
The Last of Us Part II is an upcoming action-adventure survival horror video game developed by Naughty Dog and published by Sony Interactive Entertainment for PlayStation 4.
 It was announced at the PlayStation Experience event in December 2016, and will serve as the sequel to 2013's "The Last of Us".
Dreadnought is a combat flight simulator for Microsoft Windows and PlayStation 4 developed by Yager Development and published by Grey Box with Six Foot.
 The first previews were shown in 2014; it was released on August 1st, 2017.
 "Dreadnought" entered closed beta on April 29, 2016.
 On December 03, 2016 at the PlayStation Experience, it was revealed to be available for the PlayStation 4 as well.