I think the Yoda body could be close to the right size for Wicket, or maybe could be partially used or something. Would need padding obviously. Wicket would be awesome, but you know they'd have to do a two pack or something as people would balk at a $200 Ewok--many people made a lot of noise about Yoda and he's an essential character and came with two heads.
I think the Ewoks would in some ways be easier for Hot Toys to pull off than Chewie (faces seem simpler and less complex than Chewie in terms of the sculpt) but in other ways more difficult (fur patterns like Teebo). Would love to see them try. Wicket also has part of his face covered which could simplify things potentially, but Teebo or Chirpa would be a lot more interesting.