This would require some serious hard and long work for Blizz. Much more than just making an imbalanced new class with some new skills that have partly already existed in D1 (see the Warlock Fire skills.)
Also many "new" additions of RotW are just improvements of old stuff like the new sunders and Uber Ancients.
A new act means new monsters, a new landscape, new quests etc. They would actually have to think and do a lot. I don't believe that's going to happen.
Act 4 on the other have might get 2 or 3 new areas, which probably just look like the other 5 areas. That's not so much work.
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NikoBelic
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