After waiting about two hours, the Phillies gave up on playing Thursday night's game:
#Cubs vs Phillies will play doubleheader Friday, starting at 5:05 pm ET. Single admission DH— Carrie Muskat (@CarrieMuskat) September 11, 2015
That would, of course, be 4:05 Central time, and since it's been a while since the Cubs have played a single-admission doubleheader, a reminder that those go straight through with only 20-30 minutes in between games (since Friday's original game was supposed to be at 7:05 ET, 6:05 CT).
I'd have to think that Jake Arrieta will start one of the games and Kyle Hendricks, who was originally scheduled to start Friday, will take the other start. This would push Arrieta's scheduled day to pitch in Pittsburgh until Wednesday (assuming he'd be going on normal rest) and it would mean the Cubs would have to find another starter for one of the doubleheader games against the Pirates on Tuesday (it would be Jon Lester starting one of those games).
The good news for us this evening is that as of this writing, both the Pirates and Cardinals are losing. If those scores hold up, the Cubs will gain half a game on both teams in the N.L. Central and wild-card races.
Presuming the starting time in that tweet is correct, a game preview for both games will post at 2 p.m. CT on Friday.