No real interest in the new Guitar Hero (after playing the Rock Band games for so long, the more recent Guitar Hero games feel like cheap broken knockoffs). The new button layout could be interesting, but most of the changes they're making seem very unappealing to me.
That said, it's great for DT. Really happy for them.
I am excited for Metropolis in RB4 (it also seems like most songs they're announcing for the new Guitar Hero that I'd be even remotely interested in are already available in Rock Band, since they're bringing all of their downloadable songs forward).