Original schedules had this game slotted for a 3:05 p.m. CT start, but Fox-TV has chosen to pick up the game as one of two regional games to be on your local Fox-TV broadcast channel at 12:05 p.m. CT (Tigers/Royals is the other game). Does Fox think that they might be able to get a Dodgers division clincher that day? That'd be a bit of a stretch, as the Dodgers currently lead the National League West by 2½ games and would have to have an eight-game lead by then for a clincher at Wrigley that Saturday.
There's no word yet on which of these two games will be Fox's primary game, nor which regions will be carrying which game, although with the Dodgers involved, it's likely all of the USA west of the Rocky Mountains will get the Cubs. The game had originally been scheduled to be on WGN-TV.
Remember that if you have MLB.TV or MLB Extra Innings, you can now watch any Fox-TV game that's not in your region. MLB lifted that blackout this year. Maybe the other blackouts will be reconsidered under Commissioner Manfred. We can hope, anyway.
In any case, thought you'd like to know if you are planning on attending this game.
Finally, though it certainly doesn't matter to the players what TV channel the game is on, the Cubs have not won a game televised on Fox since 2012. They were 0-6 on Fox in 2013 and are 0-2 so far this year. It's odd, but the Cubs have a much better record on CSN Chicago than on WGN (through Tuesday's game):
WGN: 25-39 CSN: 37-33 (includes CSN+) WCIU: 1-6 Fox: 0-2 ESPN: 0-1
Go figure, right?