Well, yeah. "Content" can pretty much mean anything and everything they might do to change the game. So give me more guitar-player content. Lots of it.
I'm hoping more for something along the lines of "We've got this amazing new patch that makes the UI not want to stab yourself in the brains". If they stopped making me want to stab myself in the brains every single day that'd be worth 100x more than bass support. More tunings and technique notations would also be amazing. But I'm not greedy. I know they need to hold some stuff back for the sequel. So just give me the not wanting to stab myself in the brains thing and that'd be swell.
They could add the greatest rock and roll band in the world (and a lot of people thing The Rolling Stones are that band and they already have 3 songs in the game, so...) and we'd all be scrolling past the songs 2 weeks later when they released the Nickelback pack. So DLC announcements aren't really all that spectacular to me.
At this point fixing some of the core practice tool and UI gaffes would be "adding more content to the game" to me, since I basically don't play certain songs - that I love! - due to the warts in the Rocksmith experience.
So that would in essence giving me enjoyment playing some songs I haven't bothered with due to the lack of playing things slowed down, etc and unlock past DLC I skipped on because I knew I wouldn't be able to practically learn them in game.
I completely agree with the user interface, I've stopped playing it due to it and am waiting for a patch. Taking forever too...good thing I have games in the original wrapping still since I've been playing RS, lol
I play the game regardless of the problems...and by problems I mean freezes. If they do nothing else but fix that and continue adding songs I'd be happy. As for adding bass, well that's nice. I'm not really interested in it BUT why leave it out? It's guitar too.