I believe this was already discussed, somewhere. Interpol playing Seattle in January likely has no impact on them playing Sasquatch 5 months later. I wouldn't be surprised if they were there, in fact I think we came to the conclusion that we should expect them.
No Interpol. Not that I care though. I'll give you one guess where I got this information from.
You got it from Pitchfork. I'm looking at their tour dates on Pitchfork right now. They have nothing scheduled from 5/5-7/4 with no PNW scheduled anywhere, and they're in NA on either side of that gap. I don't see why they couldn't be at Sasquatch.
And I'm sure I'm going to be constantly barraged with opposition to this, but Foo Fighters, Outkast, Soundgarden, and Arcade Fire, even with the 10th Anniversary hullabaloo, still seems like a bit of a pipe dream to have all of those in one Sasquatch.
That was my initial reaction as well, especially considering the undercard packs just as much of a punch (if not more of one) than last year's line-up. But of course that's debatable.
Is it possible that Sasquatch! made a considerably larger amount of money than they spent on acts last year in preparation for the 10th anniversary?
I don't know if anyone was still holding out hope for Belle & Sebastian coming over after Primavera, but they're playing in the UK on June 2nd, and I imagine there's a very slim chance they'd make two trans-Atlantic trips in one week.