at this point, it looks like just a tour. Matt Cameron is still in Pearl Jam, so he has commitments to them from May 'til September. There was supposed to be a Soundgarden B-sides/rarities CD...like 3 years ago. Guitarist Kim Thayil was in charge of that, but he totally fell asleep on the job.
odd coincidence...I just turned on the television, and who should be on Austin City Limits right now but Thievery Corporation. They're going to rerun it at 3 AM, if you're still awake and near a TV set. Gnarls Barkley is on the 1st half of the show; TC closes.