The most significant impact, as far as wotlk-reports go, is the tanking viability of elementals,
I think the problem with this was that they didn't get scaled to level 80. And I think they changed that. I thought I remember someone posting that they cleared a heroic with 5 shaman on the PTR.

I 100% think that all these changes are buffs not nerfs. We might have to practice kiting a little bit but it should be fairly easy with our knock back spell and fire nova totem slowing down movement speeds.