I can't answer the seating questions yet (I assume there will be some over-spill into the Scat Cat's Club area too) but I can confirm a few things that people have been asking:
1) Yes, you will definitely be able to use your refillable mugs (they are part of the Dining Plan after all, there would be a LOT of complaints if refills were not available).
2) Yes, beignets & dipping sauce will be available.
3) Yes, hot breakfasts will be available in the morning just like normal.
4) The menu will be very similar to what you can get at present, although the exact details have not been finalised as yet so I can't be too specific. Suffice to say that staples such as Mickey Waffles, Bounty Platters, French Toast, Pancakes, etc should be available at breakfast time, and for lunch/dinner there will be things like Jambalaya, Po'Boys, burgers, chicken sandwiches, pizzas, baked potatoes, gumbo/soup, roast salmon, etc. As usual, the dinner menu will include a few extra items not available at lunchtime. I'm not sure whether make-your-own items will be available, but as I said the menu is still to be finalised.
5) The Grab & Go range may even be extended to include bakery items, sandwiches, muffeletta, etc.
Andre