Oh, there's also a 6" Anakin Skywalker based on his combat appearance in Episode III that's going to be released and was originally supposed to be part of Wave 3 along with the Stormtrooper, Bespin Luke and ROTS Obi-Wan, but he was recently delayed until a later wave assortment (4?) and a carry forward of Han Solo replaced him in the wave of four.
I like Han. Solid figure. Han Solo as a character is usually a winner, and he's a core character from the OT. That said, when you have a choice between Harrison Ford in a costume specific to just one film and a plain white Stormtrooper that can used to represent Imperial soldiers across the entire expanse of the OT era, why pick Han?
The company knows that Stormtroopers sell. Han traditionally does well, but he's had some "meh" and iffy versions in recent years that don't exactly fly off the pegs and shelves, and even some well-sculpted Han Solo figures just linger with little interest. But Stormtroopers? And a 6" one at that? It'd be the closest thing to a sure bet in modern action figure retail.