I am also here to make a cross-gen comment!
I find that incredibly surprising. I don't think a racing game would sell legions of XB1 consoles, but it'd certainly move some.
This whole generation switch has been weird. Sony going balls-to-the-wall with PS3 games in the year PS4 released; and now MS keeping cross-gen going. They're not bad things, just surprising. Not what I'd expect.
The first Forza Horizon looked ace, so I'd imagine this will turn out great too. I'll keep a close eye on it. I'm planning on getting a 360 one day so I can play Tales of Vesperia, so I'd probably give one of these a try too.
Wonder what FPS they'll be targeting though. Maybe 30 on 360 / 60 on XB1?