Sadly I think it is. They're going on hiatus apparently.
http://www.billboard.com/events/foo-fighters-say-so-long-neil-young-stomps-1007964562.story#/events/foo-fighters-say-so-long-neil-young-stomps-1007964562.story
I'm so devastated. They were one of the greatest rock bands of today. I really hope they come back soon and it's not over for them. :(