Here are the changes so far in the PTR notes
- Moment of Clarity procs last 7 seconds instead of 5 seconds
- Rampant Growth also buffs Swiftmend by 20%
- Force of Nature treants buffed 35%
- Renewal buffed from 22% to 30%
- All Resto Druid damage spells buffed 15%
- Spell damage component of HoTW nerfed 25%
- Agility component of HoTW nerfed 32%
Honestly, I don't see any of these changes significantly changing talent selection. Moment of Clarity will be more viable, but even with a 7 second duration, you are realistically only looking at getting 3 Regrowths off (instead of generally 2 at 5 seconds). I can not see that being strong enough to drop 3 seconds off Rejuv's duration still. The only way MoC will become a viable choice is if they finally realize they need to make it effect more spells than just Regrowth. It absolutely needs to at minimum effect Rejuv (if not effect or partially reduce the cost of WG too).
The Rampant Growth change is only a slight buff. The extra Swiftmend healing only accounts for an extra 6k healing per Swiftmend; the bulk of the value of the talent is from the synergy with SoTF and the same issues that prevent the talent from being widely used in PvE (i.e. Druid regen is too constrained to take full advantage of it and it is an HPM loss) remain. Even with the buff, I can't see Force of Nature treants being a viable selection; SoTF and Incarnation are just too valuable. Given that treants are basically a dumb heal that you have little control over that are competing with 2 talents that give you a whole lot of control over your throughput, they almost need to have top end HPS that exceeds the other two talents to be worth considering.
The 15% damage buff effectively buffs DOC by 15%, which has the potential to put it over the top in terms of being worth using over NV/HoTW on more fights. The 25% nerf to the damage component of HoTW is largely trivial (and probably intended for challenge mode balance more than anything); it's effectively only a 10% nerf with the 15% across the board damage increase.