I expect at least 2 if not all 3 of W, I, and T to be divine classes (supposedly one is a spellcastery cleric - divine controller?). They need more divine classes to help flesh out the upcoming Divine power book. Cleric and Paladin alone are not going to produce enough material.
I'm guessing that we'll see one more primal class and two divine. So that we get 4 of each power source (not counting classes released in the PG for Forgotten Realms or Eberron).