Yes, your friend the T-Rex is working. I just recently got a preferred pass again and the first day it was down due to the refurb, but funny enough as we walked by someone asked about when it would open and an employee said tomorrow. I then turned and asked if I heard correctly, to which she said, "it should be". Emphasizing that it could not. However, the next day it it did open on the 5th so I hope you did get to ride it ePink.
The main differences I noticed since I been there last (it's been years) was that they made it a much more foggy experience, the lighting was a little different from what I remember, and all the skins of the dinosaurs seemed brighter and cleaned. They also moved the position of one of the dinosaurs tails so that it would not dip into the water, that way to prevent it from making a line on it/dirty/mold. And like I said, the T-Rex was working and was awesome as usual.