I'm assuming this is pretty much set:
Barbarian - Primal Defender
Bard - Arcane Leader
Druid - Primal Hybrid
Sorcerer - Arcane Controller
Shaman - Primal Leader
This leads us with I, T, W, and there's one controller in the bunch, probably Divine. Add another Divine and another Primal class ... I'd guess they'd both be strikers, simply because we have none confirmed and neither power source has a striker. Option 2, that'd I'd kinda prefer, is one of those Divines is another Hybrid, so Druid wouldn't be the only Hybrid class running around. Evidence doesn't seem to support it though.
This means PH2 will have:
2 Leaders, 2 Controllers, 2 Strikers, 1 Hybrid and 1 Defender for it's 8 classes.
Add the 8 PH1 classes and the Swordmage, and our 17 classes break down into:
4 Defenders
4 Leaders
5 Strikers
3 Controllers
1 Hybrid
Sound about right?