Check this out. It's quite long, but definitely worth the read as it takes up pretty much everything that's known (or at least guessed) about Tyrannosaurs right now.
I especially like this part:
In spite of the downy feathers cloaking the earliest tyrannosaurs, probably not all tyrannosaurs would have been giant fuzz balls from hell.
Life's too short to waste time being normal.
"Right Jamie, for this scene your motivation is your jilted lover. He doesn’t care about you anymore, he’s found a younger thing. And you want to wreck his pride and joy with neat, vertical slices." - Adam