Potter and Pixar magic, a new Watchmen trailer and Roland Emmerich courts the apocalypse once again. Here's what's happening in trailers:

Harry Potter and the Half-Blood Prince
Not to be outdone by those vampires over in Twilight land, Warner Bros. has released a brand new, full-length trailer for Harry Potter and the Half-Blood Prince, which, of course, should satisfy those Potter fanatics who were pissed the release date was pushed back from next week to this July. Check it out below:



2012
If Roland Emmerich hadn't chosen the career of film maker, I suspect he would have become a super villain as this film marks his third attempt to destroy the world (after Independence Day and The Day After Tomorrow) -- and fourth if you count Godzilla, though the big lizard confined the devastation to New York City. Evidence as to what can happen when a dripping faucet gets out of control, this teaser looks pretty darn spectacular. Whether or not the film has any soul to back up the effects remains to be seen, but it opens on July 10.

Up
This preview spends a fair amount of time reminding us of all the hits Pixar has had before giving us a glimpse of this newest effort. We meet Carl Fredricksen (Ed Asner), a grumpy old man who devises a unique plan for dealing with urban sprawl that's encroaching upon his home. Still just a teaser here, so story info is light, but I'm betting Pixar has another winner on its hands when the flick arrives in theaters on May 29, 2009.



Crossing Over
Immigrants of varying nationalities struggle to achieve legal immigration status in the U.S. and Harrison Ford plays an immigration official at the center of it. This looks like several stories intertwined together which reminds me a bit of Crash (should this be a good thing?). The film opens sometime in 2009.

O'Horten

In this Swedish film from 2007, a train conductor approaching retirement has several encounters and adventures. The trailer is quite vague, but this looks like a quiet little flick with a lot of charm. No U.S.release info is available just now.

Watchmen
This entirely new trailer should appeal to comic geeks and casual viewers alike, giving us a further look into Zack Snyder's take on Alan Moore and Dave Gibbons ground breaking super hero tale. I notice the characters are referring to themselves as Watchmen, which to the best of my recollection wasn't done in the comic, but damn near everything else here seems faithful. The big day for this one is March 6.

New this week on AOL Moviefone:
The Clique - Trailer No. 2 - The new girl in town tries to work her way into the popular clique at a private school in Westchester County, NY.
The Beautiful Truth - Documentary exploring the work of Dr. Max Gerson who claimed cancer could be cured by a special diet.
Gran Torino - Clint Eastwood directs and stars in this film about an aging veteran of the Korean war who must come to terms with his own prejudices. Check it out:



Underworld: Rise of the Lycans - This latest movie in the Underground franchise is a prequel exploring the origins of the war between vampires and werewolves.
The Betrayal - Documentary detailing a family's escape from Laos to New York City.
Notorious - Second trailer for the biopic of Notorious B.I.G.
Dark Streets - Trailer No. 1
Marley & Me - Second trailer for the Owen Wilson/Jennifer Aniston film about a couple and their precocious pooch.
Otto; or Up with Dead People - German/Canadian co-production about gay love from beyond the grave.
Slumdog Millionaire - An Indian man goes on his country's version of Who Wants To Be a Millionaire in hopes that his lost love will be watching. Here's the preview: