This would be a good place to do an early bird set- Luke Leia Chewie and R2. Sure R2 will be in the regular fall release assortment, but since when are they against making people buy things more than once?
This is where I was going as well. I can't imagine it being more than four figures, though a bounty hunter set would be enough to bring me in. This would also explain why they went with Pilot Luke in the first wave. It might also match the POTF2 Classic Edition 4-pack (Luke, Han, Chewie, Vader). I could see that group being a little more popular than the EB set.
If Fett is included, I'm not sure I could resist. Vader might be a must-have for me as well. It will be interesting to see if/how this is made available outside of the con. I don't know if making a hard to get exclusive is the best way to kick off a line that people are already on the fence about.