Due to heat considerations the kick-off time has been moved from 6 PM to 7 PM. The time was changed on the Texas website but I haven't seen an announcement of this anywhere else. From yesterdays AAS.
"Texas’ Sept. 3 football opener against Rice has been moved to 7 p.m., because of heat concerns, a Longhorns’ spokesman said this afternoon. The game at Royal-Memorial Stadium, which will be telecast on the Longhorn Network, originally was scheduled to start at 6 p.m."
http://www.statesman.com/sports/collegefootball/longhorns-football-notebook-1757299.html