Composite image pictures eight US cities and number '8' in centre
Band tease fans with plans for major announcement
The first of eight episodes will be shown Stateside on October 17
Tickets went onsale at 9am this morning
Producer Butch Vig confirms the band have wrapped up latest record
Band will headline Invictus Games Closing Party with Kaiser Chiefs, Ellie Goulding, Ryan Adams and more
'That's not what music's about,' said the Foo Fighters frontman
Singer says he doesn't want to just go on the road and 'sell a bunch of T-shirts'
Frontman enthuses about online campaign that led to band playing date in Richmond, Virginia
Band will be joined by Kaiser Chiefs for Cape Town and Johannesburg gigs