The time has been set for only 5 of Pitts games. 5 of their home games are TBSs. Most of their key games, ND, WVU, USF, RU, CON are TBAs. I suspect it's got to do with jockeying for TV slots. If Pitt performs as expected they'll pick up those TV slots and some of them could be become national coverage rather than just a regional game.
I also noticed the Steelers play at home the next day at 1:00 againts the Bengals. Could push the game earlier in order to get the place ready for the following day. Thanks for the info!