Over at the Neogaf.com forums it is being reported that the latest Gameinformer magazine confirms the following shocking items to be included in Guitar Hero 4:

Guitar Hero 4 (PS3, 360, Wii, PS2)
- Create a song. Although these exclude vocals due to storage and possible copyright issues.
- You'll be able to name your song as well as creating album art. After
you've done all that you can upload it to GH Tunes where anyone can
download it.
- You'll be limited to 5 songs at first. But depending on the ratings you get you'll possibly be able to upload 10 or more.
- The song sharing mode will be in the Wii and PS2 versions also, but
GI says it's unlikely that it'll be as robust as the PS3 and 360
versions.
- Drums, bass, vocals guitar
- Create a rocker
- Create a guitar and drums
- All songs will be master tracks
- They don't want to discuss specifics on track listing out of fear of
being scooped by the competition. However they confirmed 4 bands: Van
Halen, The Eagles, Linkin Park and Sublime.
- A new guitar designed by Red Octane that includes a new input mechanic that'll "impact the way you play GH in the future".
- GI saw see through notes while playing that Neversoft said was the new input mechanic and that they were trying to patent.

Drums and vocals? What an original idea! (heavy sarcasm) Ok, so what the new improvements lose in originality they more than make it up in the OMG-THATS-FREAKING-INCREDIBLE department. Making your own song is quite possibly the most time wastingly beautiful idea we're heard since Blizzard announced they were going to make an MMO. And you all know how that turned out..... teens being hospitilized due to exhaustion from staying up all night, and that didn't even involve physical activity like playing drums or a guitar! The death count on this one should be quite high, and if we've learned anything from GTA4 it's that higher death counts = more fun.