Ubisoft has a history of tardy PC releases, so much so that the phenomenon has a name: the "Ubidelay." In a recent interview with Rock, Paper, Shotgun, however, Ubisoft's Leslie Phord-Toy expressed confidence that the studio will release Assassin's Creed Unity on the PC and consoles simultaneously.
Good leadership is important for shipping software in a timely manner.
Phord-Toy blames past delays on the PC's hardware variability relative to consoles, noting that "it can be extremely challenging to try and support as many of those permutations as possible." In spite of these challenges, Phord-Toy told RPS, "Ubi has been very successful at achieving same-ship in the recent past, so we're very confident that we'll be able to do the same for Assassin's Creed Unity."
Ubisoft recently released Watch_Dogs without a PC delay, so Phord-Toy's confidence may not be entirely unwarranted. Assassin's Creed Unity is currently scheduled for a cross-platform release on October 28. Hopefully, that's the last we'll hear of this.