We dined at T-Rex in early December. I was able to charge our meal to our room using my KTTW card. Because the restaurant was still brand new at the time our waiter admitted that I could go that route but that it may take him a few extra minutes to do so. For one thing he said that their system and the Disney system were not directly linked. I don't really know what that meant. It did take a few minutes, though. They probably have worked that out by now.
FYI - there is a lot of talk about T-Rex being overpriced...On some level that is true.
My 9 year old son and I decided to split the Triceratops filet. It was way too small to be split, but the waiter (who warned us of this) supplied us with double the veggies + a double order of fries (it only comes with veggies!) at no extra cost. And it truly was one of the best steaks we have ever had. (Warning the mixed veggies have waaaay too much onion!! but still yummy) The service was wonderful and very friendly. The atmosphere was great and very unique. The Build a Dino Workshop was an awesome way to top of the evening. We will definitely return this summer and each order our own steaks this time. The experience alone will be worth the 28.00 a piece.