Everything is still unrefined (I’m killing it on mech rogue) but plagues feel strong for sure. Warlock is also doing stuff with Thaddeus and Hunter aggro is a new expansion classic at this point.
Mech rogue is nasty for sure. I played a few games with thaddius warlock and it feels crazy with what it can do. More of an aggro player personally so it's a totally different feeling in play style and I like it. Just grinded down a control priest (fuck priest) and it felt great. I did lose hard against mech rogue though it's just so snowbally.