This could be good, I'm always a fan of customization. Remains to be seen how they execute it, though. They've promised the moon and fallen short before.
I think it depends how much power they have. More talent points / bigger trees is unsustainable (and why they got rid of them in the first place).
But if it's mostly flavour with a teensy bit of modifications to spells, I'm in. Even if there was no power involved, I'm excited for my shaman to be a far seer.