Day one purchase for me.
Although I can't say this trailer gave away a Forza vibe at all. Everything seems like I am watching new Project Gotham Racing - which is not a bad thing IMO - but still it does not give away the "Forza" spirit.
Worth mentioning is that Prague looks fantastic and new lightning engine (no more IBL "reverse engineered sun" crap, this is proper lighting finally - at least in the trailer and on the screenshots) doe wonders for the urban surroundings.
I can't wait for E3 and first gameplay. This lightning and 60fps will be amazing.
X1 will almost certainly continue to use Xinput (XID) protocol and no USB wheel can't communicate with X1 in the same way it couldn't communicate with X360. Sad, but that is the reality. Of course, I would so love to be wrong.