Muse "selecting heavy festivals" this year
Eric Perrin, the communications manager of Hellfest, talked about Muse being booked for Hellfest and says the band are "doing a very small tour" and "selecting heavy festivals".
https://www.youtube.com/watch?v=9l7LdbE2QUk&t=4308s
It's not much to go on, but I would assume if they're doing that is because they want to attract more hard rock/metal fans, maybe in preparation for the next album, which could be on the heavier side. It wouldn't surprise me since Won't stand down and Kill or be killed were the most well-received singles from WOTP, both by the Muse fanbase and the rock/metal community as a whole.
Credit to @muse_iwantruth, who translated that part of the interview.