Fresh from the lumber mill:
News on the tier 9 set bonuses:
The resto druid tier 9 set bonus (2) = Increases the critical strike chance of your Nourish spell by 5%.
The resto druid tier 9 set bonus (4) = Your Rejuvenation ability now has a chance for its healing to be critical strikes.
The resto druid tier 9 idol = Each time your Rejuvenation spell deals periodic healing, you have a chance to gain 234 spell power for 9 sec.
Thoughts and feelings:
My first thoughts were, "oh no, not more crit." After all, critical strikes are out of your control. You can't save those big blooms for when you need them most, and having a 50/50 chance of Regrowth dropping a living seed on the MT in a "save the raid" situation isn't exactly ideal either. However, looking deeper at the two and four set bonuses, I'm starting to get excited. Not as excited as say my favorite Alliance druid (Quote: "EEEEEE." ~Averna), but still I'm feeling the love.
A 5% boost to Nourish crit makes 3/3 living seed even more of a must have talent. Chances are if you're running around in T9 your guild will be calling on you to single target heal every now and again, so a short cast, mana efficient, direct heal that gets better with HoTs will certainly make your life a little bit easier. Would I rather have improved MP5 or a reduced mana cost on lifebloom? Yes. But Nourish is clearly the tool Blizzard wants us using, and as of now, it's not looking to shabby.
As for the four set bonus, color me intrigued. HoT crit is kind of an insane proposition. I'm very interested to see how often it will proc, and if it procs often (say once/twice every Rejuv) I'll happily file T9 gear under the category of OP. Any more than that and you'd have to call it cheating, any less than that I might be wishing the T9 idol were the set bonus so I can keep my old idol and save some mana. Regardless, I hope a. that HoT crit is the new direction Blizzard is taking for resto druids and b. that it doesn't start and end with this tier set.