I think Kurt Vile and Beck are some additions that might be pretty great....
Ziggy Marley appears to be confirmed
[video=youtube_share;EpmCiSsWjQU]http://youtu.be/EpmCiSsWjQU[/video]
Based off the clues video I'm seeing a lot of people predict the following:
Ziggy Marley (already confirmed)
Dawes
Best Coast
Dr. Dog
Bright Eyes
I know Dawes came in because they are touring with Bright Eyes, but they played 80-35 3 years ago, I don't see returning acts making it yet, I am still reluctant to believe the Bright Eyes piece, seems to straight forward in the video, I agree with Ziggy, Best Coast though.