Awhile back Crytek were saying Crysis not being on consoles held the game's sales back significantly, since consoles are such a large market compared to PC these days. They attributed this to piracy, like usual. They tend to bitch about that a lot.
Like I said then, I think they're in for a rude awakening if they expect sales like this on consoles. I'd expect maybe 3 million combined between ps3/360 for Crysis 2, which certainly wouldn't put the PC version's sales to shame.
Though I could see the console versions having slightly better initial sales. Crysis had crazy legs, and I'd expect the PC version of Crysis 2 to do the same. At the very least it'll replace its predecessor as the benchmark title with which to show off your new rig. I can't think of a single person over the past several years that didn't buy Crysis to show off their freshly upgraded PC lol. I did this past May!