Yes, it's essentially just a trailer. But it's a REALLY LONG trailer!
In an effort to simultaneously promote the upcoming Resident Evil: Operation Raccoon City (the game hits the PS3, Xbox 360 and Windows platforms on March 20), and to assure fans that the game, despite being an online-capable, action-heavy third-person shooter, is very much a Resident Evil title.
So, let's have a look at how Capcom did, shall we?
Alright, so we've got the undead. Check. We've got questionable medical procedures. Also, check. Lickers clinging the ceiling? That's a check too. How about "hardened paramilitary badasses fighting amongst themselves and proving that even in a world overrun by biological horrors mankind is its own worst enemy?" Um ... yup. We've got that here in spades.
Okay, so, everything seems to be in order. Granted, we would have liked to see the developers go for bonus points with a well-timed Albert Wesker cameo, but that aside, this clip does appear to be from a genuine Resident Evil game. Especially the bit at the very end where the game's marketing team attempts to sell you on a $70 special edition by promising alternate downloadable costumes and random art trinkets.
That's textbook Capcom.
Source: Capcom Unity