That backpack for Yoda looks so small that I don't think even his head would fit in it!
Anyway though, I like the looks of this wave. I've always wanted a Luke like that, I think it would have been great to make the Luke and Yoda in an Ultra 2-pk like that and then release a different Luke later with repositioned arms and a new head. Guess Hasbro wasn't on the same page as me on that one though.
As for R2, I will get one, but I can easily customize my own that way (which I did). So to me it's not overly necessary but I do think they did a good job with it.
Yoda looks a tad too tall and skinny, and yes his backpack looks like it was made for a smaller midget than Yoda.
Obi Wan is the prize of this wave though to me. What a fantastic sculpt; I pray that we get another release of this figure without the bluish tint, so he can be a neutral posed Obi Wan from ANH as well.
Overall I think this is a great looking wave, not as exciting to me as the recent Tatoone/Jabba's Palace/Yavin waves, but still very, very nice.