Resto Shaman is still very strong in arena. Earth shield is great and the totems, purge, windshear + BL still make shamans great in lots of comps. The edge pallys have now is without a ton of resil they can survive longer especially with bubble and are much better with melee for freedom and bops.
Resto shaman are still better offensively. They are better with spell cleaves imo and the comps we saw in previous seasons like RLS, Feral/L/S and R/SP/S are even better now with shaman dispels.
I see a lot of pally double melee like bleed cleave and rogue/feral/hpally having good success off the bat.