This will be the big question to see if HT crosses over to expanded universe stuff. I have a hard time seeing them do it. Does anyone is Asia watch the cartoons?
It's not EU, Clone Wars is canon. A Rex figure is no different from a Mandalorian figure in that regard. Now whether they extend to non-live action canon is another question.
SS Rex holds up pretty well, except for the head sculpt. If you use the helmet, he looks great in a display with Hot Toys figures. Nice weathering, detail, etc.
Personally I think Rec is one of SS better head sculpts. In fact if it wasn't for the hair seam I'd put it at HT levels.