This is clearly going to be 360's peak year but I think the overall picture at the moment isn't entirely clear. I strongly suspect we've been overtracking the 360 in EMEAA since the slim launch if this is to be believed:
http://gamrconnect.vgchartz.com/post.php?id=3574004
Although I have my suspicions since he doesn't site a source. And I would suspect with a PS3 price cut in PAL 360 would have a lot of trouble retaining it's current momentum in Europe. I would predict that it will beat 2008 by about 500k.