As much as I am rooting for Inquisitor, I have a strong feeling that it will be a Templar, They already added Paladin, they added Crusader, and now that we know the Church is involved somehow, and the introduction of the Templars in D3, and the fact that the D3 Templar has some much unfinished business within his shady ass order (The Church?), there is a very strong chance that Kormac will be the Templar that we play.
But I am still rooting for Inquisitor...Give me those holy exorcisms!
Given that D4 is 20 years after D3 i very much doubt Kormac is even alive, but even if he is the dude is around 60+ years, doesn't make for a very effective templar. xD