Instruments
Guitars
RedOctane has reworked the guitar controllers quite a bit. They are wireless controllers with one set of five colored buttons at the end of the neck and a touch sensitive area closer to the body that allows for much easier sliding between the different notes, giving a feeling more similar to playing a fretless guitar, for those of you who know what that's like. Additionally, there is a button built into the bridge (at the bottom of the neck) that is a select button, with a ridge around it to keep it from being accidentally hit during a performance. A D-pad is cleverly disguised as a guitar volume or effect knob and is out of the way, on the edge of the body, to prevent accidental activation, as well.
Drums
You've likely seen the drum set for
Guitar Hero World Tour before, but it's worth pointing out that instead of the four pad plus kick drum that is featured in
Rock Band,
Guitar Hero World Tour features a drum set with three drums, two cymbals and a kick drum. That's one extra thing to (intentionally) hit, for those who are looking for something more challenging. Not only that, but these drums feature velocity sensitivity, which means that if you hit harder, the drums sound louder.
Rock Band's drums were analog; they were either not hit or they were. Velocity sensitivity goes a long way to give you creative control as a drummer.
Microphone
Well, there's not much to say here, other than the fact that
Guitar Hero World Tour now includes a microphone. It is corded, and the cord seemed to be of a reasonable length, but it doesn't have any bells or whistles that I noticed. Which is probably fine. It's a microphone. Moving on.