This is the new Saesee Tiin from The Clone Wars, which is a very good figure with a very cruddy jetpack.
Last year's Darth Vader was barely a new figure-- it's a tinkered revision of a figure mold that debuted in 2005. It's still really good though-- I almost wish the helmet was not removable, but that's my life. Read on!
There have been many, many versions of Captain Rex and this one, from a 2010 ARC Troopers Battle Pack, is likely the hardest to get. He has a unique helmet and gun, for starters-- so should you get it? Read on!
It looks like a figure you bought, but it's not. The Republic Attack Shuttle Clone Pilot uses a new body style and has unique deco on his shoulders... so he's different! Sort of. The ship is good, at least. Read on!