Why would the warg design need changed? I think WETA should stick to the already established look as I feel that one is perfect.
I dug the heyena-like Wargs, too, but I've seen interviews with PJ (sorry, can't remember any specific links at the moment) where he noted that he was never satisfied with the design but just ran out of time. And I've seen comments by both him and GDT that the Wargs in The Hobbit will be more wolf-like.
And they don't believe a redesign would mess up continuity because the rationale is that they're both Wargs, but slightly different breeds.
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