I'm looking through new talent calc. And what I noticed is that:
-Metamorphosis doesn't need Demonic Fury (or other resource) to last. It just lasts till canceled.
-Meta gives crit immunity and big boost to armor
-While in meta most of our spells become instant cast. curses, corruption, Hand of Guldan, shadowflame, Demonc Slash (which replaces Shadow Bolt and is instant).
-We can spec into petless warlock that gains boost to HP
A crazy idea, but it starts to look promising that we're either getting more mele oriented Demo warlock, or even a possible tank role?