DLC info was found in the game's archives. I went through it and collated what I think is going to be in it:
- Endor level. Evil Starkiller turns up in the Rogue Shadow 2.
- Fight Ewoks, Leia, Han, Chewie and an AT-AT.
- 3 types of Ewoks - rocks & slings, spears and gliders
- 5 new challenges
- 2 new costumes (both reskins of Starkiller)
- 2 new saber crystals, yellow and silver (increase saber damage and increase force attack damage)
The Region screen for the Endor level makes mention of the second Death Star with the Emperor's throne room.
update: unlock the challenges, costumes and crystals on the PC version now
add those 3 xml files to pak2.lp using winrar in the folder \Game\Disc\Runtime