While I like the idea of having unreleased material, I would want them to wait until they have alot of material, and make something epic like Pearl Jam - Lost Dogs.
Or... Imagine this, it's AB's tenth anniversary (it's only in like 4 years isn't it?), so they make one amazing package, with all the unreleased material to date, photos, documentaries, artwork, etc. That'll be cool.
If they do release an EP, I hope they release it when things aren't really happening with AB, so when Creed do a really big tour, or start recording. That way the wait won't seem too long for AB to get back into motion.