Nope. No real bosses. You have to kill a few tanks on your way to the objectives, but nothing special. You get to see
and his ship, but you don't even fight him, just his uber-lame bodyguards.
And if by ending you mean a 20 seconds cutscene of the Republic fleet over Kashyyyk seen from the window of the dropship, and some lines from Yoda, then I guess it's got an ending.
Oh yeah, I almost forgot. Your reward for finishing the game is an ultra-lo res 40 seconds long interview with Temuera Morrison. Yay.