Wizards is releasing an Attack on Endor scenario pack this February. It's a replacement for their failed line of Ultimate Missions books, and will contain an AT-ST, three Stormtroopers, a small scenario book and two double-sided maps. It can be preordered for $14.99 at coolstuff.inc and for $13.99 or less at iconusa.com. Notably, this means that entire package costs less than a single AT-ST from the Universe set on the secondary market.
Sadly, no extra Ewoks are in the set.