Guitar Hero 4 will reportedly include a set of drums, a bass guitar and microphone support and allow you to create and share your own songs.
That's according to a poster called SolidSnakex on NeoGAF who has listed the contents of an upcoming Game Informer preview. Activision declined to comment when contacted by Eurogamer.
The game is listed for PS3, 360, Wii and PS2, although it says that the Wii/PS2 song-sharing element will be less "robust" than it is on 360 and PS3.
According to the post, a new guitar peripheral will introduce a "new input mechanic", which involves "see-through notes" and will "impact the way you play GH in the future", although there are no details yet about the drums, bass or microphone elements - other than your ability to create a rocker, guitar and drums in-game.
Meanwhile, the music-creation element will allow you to create up to five songs with everything except vocals (apparently due to storage and copyright issues) and upload them to a Guitar Hero song-sharing service. If your songs get good ratings you will then be able to upload more. There will also be a facility for creating album art.
Elsewhere, all the songs will be based on master recordings (so no more "As made famous by" - sniff!) and Van Halen, The Eagles, Linkin' Park and Sublime are mentioned. Apparently Neversoft and Activision didn't want to discuss other specific bands for fear of being beaten to the idea by Rock Band. Perish the thought.
Obviously none of this is confirmed for now, but it ties in nicely with what Activision said earlier this month about a "significant leap forward in innovation" and what the publisher's Bobby Kotick said in April about "other instruments" and "vocals".
Expect to hear more very soon.