Toughness
Is it Pre-requisite? If not, better go for Improved Toughness for 4 instead of 3 HP.
It is indeed for Troll-Blooded.
Even so, incarnum toughtness is a better choice overall.
I'm certain a type-changing template would violate my whole "human" thing, otherwise I'd have gone necropoliton, slather myself in psionically created black lodus, and go hug enemies.
well, you ought to retain the (human) subtype.
If taking the template makes you no longer human, you burn a first level feat on "human heritage", and suddenly you're humanoid(human) again (with undead traits)