It’s been ten years since Metal Slug X, and now Atlus is bringing Metal Slug XX to the PSP on February 23, 2010.  If you’re curious what the new game might have in store, you can check out the brand new trailer for the game below or visit the game’s website at http://www.atlus.com/metalslugxx/.  The game will include a brand new “Combat School” as well as a the Main Mission story, and will let you play as any one of the original characters.