For all we know Blood Magic could be available, just not a dedicated specialization. And healing will be available to any Mage.
Knight Enchanter has a really cool icon, that helm looks ace 
So, Knight Enchanter is the melee mage (i wonder if they can wield greatswords too?), Necromancer is here finally, and Reaver is back.
What to choose, what to choose?
Also, it's really good that Blood Mage and Spirit Healer are not dedicated specializations. It doesn't mean the magic they wield is not available, however. So don't be quick to be dissapointed.
I doubt Bioware is gonna take away from you Healing and Blood Magic so easily. Healing is still there for you, probably as a tree, and Blood Magic... Who knows, a tree? An ingame power? Necromancer is actually a summoner Blood Mage?
We'll have to see.