Yeah, I think a decent prequal Yoda for E1 and E2-3 is in order, but honestly I'm pretty content with our Yoda's from OTC and VOTC that cover the original trilogy. VOTC's my preferred one due to the poseability and softgoods, and OTC Yoda's nice aesthetically, and works well in Luke's pack.
A great ROTS Yoda though, that's something needed IMO.