Here's on overview with the mostly 'confirmed' rumours on this (courtesy of pearljamonline.it):
Apr. 06.2007 (Billboard): Mike McCready has revealed that after the last tour ended, band members have been demoing material on their own while staying in occasional contact via email and that he has tested out some ideas with guitarist Stone Gossard and drummer Matt Cameron in separate sessions as well. Talking about future Pearl Jam projects, McCready has said that Pearl Jam has "no set date" for returning to the studio and added: "When we get it all together, we'll decide to do a record. That may be a year from now or half-a-year from now".
Oct. 2007: Insisting, unconfirmed and unofficial rumors report that Pearl Jam will be back in studio in spring 2008 to work on a new album.
Feb. 03.2008: Jeff Ament appeared at a Seattle Sonics basketball game. Interviewed by announcer Kevin Calabro, Ament revealed that Pearl Jam are "gonna get together here in a couple of weeks and try and write some stuff" for the Seattle band's ninth studio album.
Feb. 15.2008: Billboard has confirmed that before Vedder hits the road with his US solo tour in April, Pearl Jam is expected to regroup and start sketching out material for its next studio album.
Comments
"You boo us, you call us pussies, and still we come back." EV NJ1 2006
2008 MSG 2
2006 NJ 1, NJ 2
2003 MSG 1
Apr. 06.2007 (Billboard): Mike McCready has revealed that after the last tour ended, band members have been demoing material on their own while staying in occasional contact via email and that he has tested out some ideas with guitarist Stone Gossard and drummer Matt Cameron in separate sessions as well. Talking about future Pearl Jam projects, McCready has said that Pearl Jam has "no set date" for returning to the studio and added: "When we get it all together, we'll decide to do a record. That may be a year from now or half-a-year from now".
Oct. 2007: Insisting, unconfirmed and unofficial rumors report that Pearl Jam will be back in studio in spring 2008 to work on a new album.
Feb. 03.2008: Jeff Ament appeared at a Seattle Sonics basketball game. Interviewed by announcer Kevin Calabro, Ament revealed that Pearl Jam are "gonna get together here in a couple of weeks and try and write some stuff" for the Seattle band's ninth studio album.
Feb. 15.2008: Billboard has confirmed that before Vedder hits the road with his US solo tour in April, Pearl Jam is expected to regroup and start sketching out material for its next studio album.
EV: Amsterdam II 2012, Amsterdam I/III 2017, Amsterdam I 2019
Brad: Zoetermeer & Utrecht 2013
Soundgarden: Pinkpop 2012, Amsterdam 2013, Utrecht 2014