Question: When was the luxury brand, which manufactured the Genesis G70, officially announced as a standalone marque?

Context paragraphs:
LaSalle (automobile): LaSalle was an American brand of luxury automobiles manufactured and marketed by General Motors' Cadillac division from 1927 through 1940.  Alfred P. Sloan developed the concept for LaSalle and certain other General Motors' marques in order to fill pricing gaps he perceived in the General Motors product portfolio.  Sloan created LaSalle as a companion marque for Cadillac.  LaSalle automobiles were manufactured by Cadillac, but were priced lower than Cadillac-branded automobiles and were marketed as the second-most prestigious marque in the General Motors portfolio.

Louis Vuitton: Louis Vuitton Malletier, commonly referred to as Louis Vuitton ( ; ] ), or shortened to LV, is a fashion house and luxury retail company founded in 1854 by Louis Vuitton.  The label's LV monogram appears on most of its products, ranging from luxury trunks and leather goods to ready-to-wear, shoes, watches, jewelry, accessories, sunglasses and books.  Louis Vuitton is one of the world's leading international fashion houses; it sells its products through standalone boutiques, lease departments in high-end department stores, and through the e-commerce section of its website.  For six consecutive years (2006–2012), Louis Vuitton was named the world's most valuable luxury brand.  Its 2012 valuation was US$25.9 billion.  The 2013 valuation of the brand was US$28.4 billion with revenue of US$9.4 billion.  The company operates in 50 countries with more than 460 stores worldwide.

Genesis G70: The Genesis G70 (Korean: 제네시스 G70 ) is an entry-level 4-door luxury sedan manufactured by Hyundai's luxury brand Genesis.

Luc Donckerwolke: Luc Donckerwolke (born 19 June 1965) is a Belgian car designer for Hyundai's Genesis luxury brand and former Design Director of Volkswagen Group's Bentley, Lamborghini and Audi.  In November 2015, he was appointed to lead Hyundai Motor Group's Genesis luxury brand from 2016 and will work together with Hyundai-Kia's chief designer Peter Schreyer.

Lexus F: The Lexus F marque represents the high-performance division of cars produced by Lexus.  The F marque refers to Flagship and Fuji Speedway, the chief test site of Lexus performance vehicle development in Oyama, Suntō District, Shizuoka Prefecture, Japan.  The first vehicle in the Lexus F marque lineup, the Lexus IS F, was announced in 2006, followed by an F marque coupe concept, the Lexus LF-A, in 2007, and the production LFA supercar in 2009.  All Lexus F performance vehicles are denoted by namesake badging on the front fenders.  A related performance trim line, Lexus F Sport, was launched for 2007, with an F Sport accessory line and factory models in 2010.  Lexus F models have been developed by the Lexus Vehicle Performance Development Division, which has also been involved with the brand's racing activities.  The "F" designation was originally used at Lexus' launch in 1989, as an internal code for the development of its first flagship vehicle.

Klaus Heine: Klaus Heine is a lecturer in luxury marketing, luxury brand management, brand personality and brand identity at the Technical University of Berlin and works as an independent consultant specializing in luxury brand management.

Maybach 57 and 62: The Maybach 57 (chassis no.  W240) and 62 (chassis no.  V240) were the first automobile models of the Maybach brand since the brand's revival by DaimlerChrysler AG (now Daimler AG).  They are derived from the Benz Maybach concept car presented at the 1997 Tokyo Motor Show.  The concept car was based on the Mercedes-Benz S-Class sedan, as are the production models.  The Luxury Brand Status Index 2008 voted the Maybach first place, ahead of Rolls-Royce and Bentley.  The models ceased production in 2013, due to continued financial losses for the marque, and sales at one-fifth the level of the profitable Rolls-Royce models.

Spyker Cars: Spyker Cars ( , ] ) is a Dutch sports car marque.  The modern Spyker Cars holds the legal rights to the brand name.  The company's motto is ""Nulla tenaci invia est via"", which is Latin for "For the tenacious, no road is impassable".  The marque's logo displays the rotary engine of an airplane, a reference to the historic Spyker company which manufactured aircraft.  In an attempt to save Spyker from bankruptcy, Swedish Automobile in September 2011, announced the immediate sale of Spyker to American private equity and hedge fund North Street Capital for €32 million (US$41 million).  On December 18, 2014, Spyker confirmed that it deliberately had gone bankrupt, hoping to restructure its finances and getting back on its feet.  However, the bankruptcy declaration was reverted early 2015 and the company announced to continue with the production of sports cars.

Genesis G80: The Genesis G80 (Korean: 제네시스 G80 ) is a four-door, five passenger, executive sedan manufactured by Hyundai's luxury brand Genesis, successor of Hyundai Genesis.

Genesis Motors: Genesis Motors is the luxury vehicle division of the South Korean automobile manufacturer Hyundai Motor Group.  Initially envisioned along with the plan for Hyundai's new luxury sedan Hyundai Genesis in 2004, the Genesis brand was officially announced as a standalone marque on 4 November 2015.

Supporting paragraphs: Genesis G70 Genesis Motors
Answer: 4 November 2015