According to Mtv.com Meteora will be a multimedia disc that contains both the regular cd and some video counterparts to be played on the computer (what they are I don't know). Here's the link Meteora
It's just gonna be one disc, but meteora is gonna have some enhanced bonus media things, like on the reanimation disc.
The DVD will also be included At least if you get one from the first shipment, because they probably wont have the DVD's with them after a week or something.