Clone Trooper Lieutenant
This will prove to be a tricky set for Star Wars minifig and polybag collectors to get hold of... Apparently it was given away to kids who entered a trivia competition at this weekend's Star Wars event at LEGOLAND California.
Let's hope it turns up somewhere else in the world; similar polybags (e.g. Darth Maul) have in the past.
(Thanks to Adam K for supplying the image).