For me the greatest pro and con is both the amount of content there is to do.
I find myself having less and less time for the game, but wanting to play it more and more.
Its a real golden age for WoW right now, and I have not felt this compelled to do things (especially 5 mans) since TBC.
Especially if they end up releasing legacy, there is just going to be nothing but wow in my free time.
Its a good feeling really.