(I'm just going to post new info about DLC here unless there's a better place)
The official JP site has been updated including a picture for each new Over-Class
Edit: Vincent has update the main site with the new information. Please check the page for the new details
DLC Series 2
Temple of Stars ~Inner Sanctum~ - Reward: Items (unlimited), Star Shards (random drops), Starsphere (all Star Shards and Black Pearl, unlimited)
Golden Dream - Reward: Gold Marks, Silver Marks (unlimit