Looks like Foo Fighters are starting to tease the follow-up to their 2017 record Concrete and Gold, and their tenth overall album. So far two posts from fans have surfaced online about sightings of a Foo Fighters graphic on two separate screens, which sports the band's logo and the Roman numeral X.
If you're looking for a more immediate fix of some Foo Fighters music, maybe go stream their Amazon-only live EP Live On The Radio 1996.
Second “FF X” sighting in my neck of the woods…Sherman Oaks, CA from r/Foofighters