The new changes look like a lot of fun, and shaman might turn out to be really powerful. The abilities seem to have a great fluid rotation.
However, the new totemic hero talent tree is a genuine rework of the spec, and it fixes a ton of the problems around spam casting healing rain. It also will synergize incredibly well with the new talent reworks, specifically around healing rain updates and the new chain heal bounces off of totems.
I would really like to see totemic get baked into the base spec, and they come up with some other hero talent tree to replace it.