Harmonix is missing out on a huge opportunity by not releasing their upcoming game on PC. The PC market has been booming in recent years due to digital distribution services like Steam, but there's a severe lack of good commercial rhythm action games. It's understandable that previous games in the Rock Band franchise have been console exclusive due to the need for special controllers but for this one there's no reason not to port it to PC; Blitz would play fine with a keyboard or a USB controller. There's definitely a huge gap in the market and it's silly for Harmonix not to fill it.
Plus I want to play it too. :P