The other Character Pack allows you to play as an "Imperial Commando", from what I could see, it was just a Republic Commando. Need 400MS points to get it, and I have...0. I bought the Temple Mission Pack, which also comes with Character Skins--Qui Gon, Mace, Maul, two training Droids, and two varients of the Sith Stalker, w/o helmet and even more Cybernetic.
Mission was fun, achievements easy, story....minimal. But kind of (barely) sets up a possibility of more. Also, a note--difficulties don't unlock lower achievements--ie, beat it on Sith Master, and you only get that achiement, not The lower difficulties. Not sure why.
[url=http://www.youtube.com/watch?v=Yff3jH8NECs]"Touch my Awesome Button."[/url]