Give a stream of consciousness and then the final answer. In February 2017, Muse announced a North America tour with Thirty Seconds to Mars and PVRIS to take place later in the year. Howard confirmed on his Instagram the band were back in the studio. On 5 April, Muse posted studio footage on social media and announced a new song to be released soon. On 8 and 9 May, the band teased the new single in behind-the-scenes clips of the filming of a music video. On 18 May, Muse released a new single, "Dig Down". In an interview with Zane Lowe on 18 May, Bellamy said Muse will release a new album in 2018. On October 5, 2017, it was announced that Muse will be playing BlizzCon 2017.

Answer this question: when does the next muse album come out?
To answer the above question, the relevant sentence is: In an interview with Zane Lowe on 18 May, Bellamy said Muse will release a new album in 2018.
So, the final answer is 2018.