I'm liking the changes. I think for general 5 man play Druid healing will be very powerful, as I'm already having zero problems even when poeple mess up. The change to improve our mastery is also amazing, as layering out spells is just crazy powerful. 6k crits from rejuv? Yes please! :-)
As for Raids, I am not sure. I don't raid much, only Baradin's Hold, and I did not find myself using Nourish at all. It would be cool if the 3 rejuvs gradually increased the cast time of Healing Touch. Like 5% haste per Rejuv.
Finally Regrowth is a spell that I use often for the living seed proc and also a mini HoT for layering/swiftmend. However it could use with something else. I like the idea for the glyph, but it really sits as a major and not a prime in my opinion. A prime glyph for Regrowth would be to link it back to Effloresence in some form.
I also agree with posters about guardian spirit and aura mastery. Perhaps Tree Form could get its aura back? +10% healing received on the whole raid for the duration, rather then +15% to our own spells would certainly improve out utility, and be great for those raid healing spots.