Ok, nevermind, I looked again, and both pages in the envelope were just from UT in general. Looking at my acceptance e-mail again, it says this:
"Within the next few weeks, you will receive official letters of admission from both The University of Texas Graduate School and the LBJ School of Public Affairs. The LBJ School letter will include the terms of your admission, instructions for confirming your intent to enroll, and announcement of any fellowships you may have been awarded. "
Looks like the letter directly from the LBJ school will mention fellowships, and who knows when that might come.