This game is really nice, I just started to play it on the train last night. It is quite addictive.
The game starts with creation of your profile. Then you can select single or multiplayer action. It is a third person shooter, you get to play both sides.
I started with missions, chose to be a Imperial Enforcer. The tasks are very simple, kill x of y in z seconds. You start by killing Gungans (aka Jarjar Binks and his friends, lol), then onto other planets. I am at the 3rd level, where you need to kill 45 ewoks in 6:30 mins.
You can play on foot, or grab you some vehicles, which is very cool.
Here is some pics of the