Yeah, I think they are a hot seller right now. Part of it is just straight up collectors chasing the nostalgia and doing what we have all been programmed to do. I think the other big part of the heat right now is the entire wave in one case with no duplicates, no chase figures. It's not an assortment of $10 figures so much as it's a $60 multipack. And then folks want multiples of the multipack, and store supplies dry up insanely fast.
Once Hasbro realized this (data from the Target website presell, I am guessing) they went back to the factory to do another run, and announced just prior to the line's "street date" that more are coming in the fall, which is probably as fast as they could get a factory turnaround. This tells me they knew the supply of the intial run was not going to hold out.
I have hopes for a wave 2, but I can't imagine it just being the "other 6" of the first 12 since all the heavy-hitters were already cherry picked. And the droids are a problem in and of themselves because Hasbro doesn't vac-metallize anymore. The selections could get interesting, I have no idea how to even formulate a guess as to where they will go.
I do expect retreads to knock out variations like small head Han, tan-hair Farmboy Luke, maybe even green-limb Chewie. My hope is we could get some retooled figures like removable helmet Vader, a Luke without the lightsaber built in, Sandtrooper, etc. And that is only working within the 6 figures already made.
I am also wary of Hasbro using the brand-new Retro figures as an upsell for larger items like they pulled off with Tarkin. It would be conceivable to get, say a Stormtrooper Han and/or Imperial Scanning Tech with a Death Star (extra points if it is a Palitoy Death Star, but I'd take a Kenner version too.) Cantina Band Member with the Creature Cantina, Sandtrooper with Dewback, Wedge or Biggs with X-Wing...they could really make a lot of interesting combos that the collectors would gobble up.
And really, it is only a matter of time before we get Retro prequel and sequel figures. I just hope they don't come to dominate the release schedule.