According to BigBadToyStore, the case assortment for wave 5 will include eight figures:
1x SW 6 Inch EP4 Chewbacca
2x SW 6 Inch EP5 Darth Vader
1x SW 6 Inch EP6 Luke Jedi
1x SW 6 Inch Sandtrooper
3x SW 6 Inch Boba Fett
This matches what was shown at Toy Fair. Presumably this will be the first wave with the taller boxes and blue accents replacing the orange. The Sandtrooper will have a black pauldron as opposed to the orange one seen in the first wave.
It's interesting that Boba is being shipped three to a case here, especially after he's coming back in wave 4. This sounds like it could lead to some overkill, but Boba has never pegwarmed in the 3 3/4" scale so I think it will be fine. He's definitely a figure that should appeal to non-collectors. I do think it's a good move to have two Vaders, at least.