DJ Hero is becoming more and more interesting. During a financial call with investors and analysts today, Activision Blizzard's said that in addition to a turntable peripheral, their upcoming music game will also include optional guitar parts to be controlled by a Guitar Hero (and we assume Rock Band) guitar.
Don't expect the opposite to happen, at least not yet. The company described the turntable peripheral as "unique" to DJ Hero. If DJ Hero proves a major success, however, there's no reason to count it out.
I'm still listening to Activision Blizzard's call, and if any other details on DJ Hero are released -- other than the company bragging about its sales possibilities -- I'll make sure to update this story accordingly.