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:

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.

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.