So I haven't really kept up with WoW very much at all; quit back at the end of Cata in February 2012, and completely stopped playing until fall of '13 when I bought MoP and played a bit. Got a little bored of it though, and haven't played since April or so, and haven't kept up with WoD changes either.
I know they're updating the models, and stat squish, raiding difficulty changes and things like toybox, but what other big changes are coming? I heard people mention "heirloom tab" and gear that switches stats when you switch specs? Anything else of importance?