ManiaPlanet 2.0 will be an upgrade to the game itself, not a website. Although the update to trackmania.com and shootmania.com was a step in the direction of ManiaPlanet 2.0.
I'm skeptical that Valley will be like what we saw in the trailer from 2009. That was a long time ago. It could be similar, but it could also end up being totally different. At least I hope the scenery is different. The 2009 trailer shows scenery far too similar to Canyon, albeit with different textures. The way the car takes curves and generally behaves looks a lot like Canyon too... except at a slower speed. I hope the feel of the car isn't "Canyon but slower". I hope it's a totally different physics like we're used to experiencing with the different environments of TM1. Only time will tell though.
For now, I'm more excited about the new blocks with this update and what kinds of tracks we'll be able to build with them in Canyon.