The first preview of Harry Potter and the Deathly Hallows: Part 2 aired about an hour ago on ABC family (8:05pm) for those of us on the East Coast and is now available to watch below. I also expect that WB will be sending over HQ versions of these clips sometime next week, so stay tuned for that! Neville can be seen right at the end (1:26) of the clip so keep your eyes peeled.
UPDATE: Thanks to WB I’ve added a better quality version of the video