Guitar Hero IV to work with Rock Band instruments for 360

[EaglesEye379]

Its already officially announced at E3 that all RB1 instruments (360 version only) will work with GHWT.

The songs will actually change to 4 colours + bass pedal when you insert the RB1 drum.

What I need to know is whether the GH4 guitar will work with RB1&2...