From
http://forum.guitarherogame.com/Defa...=22638&p=1
2. I'm not allowed to comment on any DLC issues... when I am, I'll be sure to post here. There are reasons for the delay that I'm not allowed to get into. Everyone at RedOctane is aware of the concern/ frustration of some of you... at this point people still complaining and constantly starting topics trashing the company are really, really just beating a horse that's been dead for awhile.
And a few posts further down (posted on June 13th):
You should hear more about DLC soon (within the next few weeks).