It's a hint at just how intense the band's latest work could be - and they'll offer more details in a "major" announcement on Monday. Grohl previously revealed they recorded each of the record's tracks in a different studio, and they made a documentary episode about each session. It's due for broadcast in November, around the time of the record's release.

On Wednesday, a preview of what's thought to be the album cover was leaked via Reddit, featuring the figure 8 and a composite image of the cities the band visited while they worked.