So at this point is death knight for everyone going to be the only new class/race combination, I had hoped there would be new combinations announced when alpha hit.
We don’t know.
Just gimmie a goblin monk, man.
Now that we don’t have to start in Kezan, there’s no reason an enterprising goblin teach mall karate at a nominal fee.
Well I shall keep Hoping for a Nelf Pally

Vulpera Papadin baby. Let’s go.
Tauren/Draenei rogue
With new starting areas there is no longer any reason at all to limit Monks from any race. Goblin and Worgen need to get the class.
Night Elf Paladin is a thing in Legion Paladin class Order hall so theres that. Forsaken Paladins would be nice. Blood Elf Druids would be glorious.
Void elf demon hunter. Need to open the gates to the fel academy sometime again, given the legion’s defeat, now is the perfect time to consider that.
If not then I’d pick Lightforged Draenei rogues, think not of stealth but of the fact that no one expects the spanish inquisition.
I would consider play a dh if they could be orcs… however it will probably never happen