I agree with Jeff - Hasbro really put some extra effort this time around as opposed to just cranking out some repaints.
With the three ARC troopers, they aren't just repaints of the Comic 2-pack Alpha - sure they use some of his common parts put they mixed up the kamas like Jeff said and the body of the yellow ARC that comes with Master Sev is actually the Evolutions ROTS Clone.
The Tsui Choi figure is great. I'm not sure if any of his parts are recycled from say a Yoda figure, but it doesn't matter since the figure is so sharp. The BARC Trooper is great and thanks to the SA body, can hold the heavy chain-like gun well.
I am extremely pleased with the soft-goods addition to the Anakin figure - it makes for a REALLY sharp figure. Goes to show how solid the Nelvaan Anakin figure is. Nothing overly special about the Palpatine except for the fact that he's now got the deathly gray skin-tone that he sported in ROTJ.
I think the wires at the bottom of the cloaks was something interesting for them to try. Not to pleased with the Obi-Wan figure, but the cloak is kinda cool.
I think out of all 12 figures, the only ones I'm kinda feeling ho-hum on are the Obi-Wan and Luminara. The rest are great additions to the collection.
I have now found two years running, getting a complete set (or in my case three complete sets plus some extras) before the "set date" is a fun challenge. So if they keep raising the bar on these and keeping the price $9.99, I would welcome a third series next year, but instead of Order 66, I could see Target getting their own wave of Droid Factory instead.