I can't answer this question precisely for all of the schools, but the 2011-2012 entering class at UTSW had a mean cumulative GPA of 3.8 and MCAT score of 34. We were also given the following breakdown on interview day:
Also, I remember UTMB had an average MCAT/GPA for 2011-2012 of 28/3.6. UT Houston's was 32/3.7. Although I can't remember the others exactly, BCM's was similar to UTSW's, and UTHSCSA was somewhere between UTMB and UT Houston, 31 MCAT I believe. Tech and A&M were in the same range as UTMB.
I hope this helps. The numbers for UTSW came directly from the informational packet we were given on interview day. The others are from memory, but I'm fairly confident in the accuracy of these as well.