The team's plan is to have the game be feature complete by the end of Alpha. This means Alpha 2 could launch with just a few classes and then more and more will come out over time. Then when Beta starts, we would be seeing the classes they plan to have at launch basically firmed up and finalized.
My hope is that when Alpha 2 starts we are getting 1 representative from each part of the trinity, and another support class besides Cleric which I hope will be the Bard.
It would make sense to give everyone the complete trinity to make group content testing viable, but it will also be important to start to see how secondary support classes will figure in as a key group component.
Therefore I think the Alpha 2 launch classes should be:
- Tank
- Mage
- Cleric
- Bard