The shooter has moved from its original October date to December 1.
"This wasn't an easy decision, but based on the feedback we've received, and based on our own internal tests, we felt there are adjustments and improvements we can make, including improving the co-op experience across all game modes, weapon and gadget balancing, as well as menu and interface navigation," Ubisoft said.
"We're taking a little more time to make these changes, and we think it's the right call."
The closed beta will still start on 24th September 2015 as planned, so that's something at least.
"We understand that many of you are excited to get your hands on the final game, but as gamers ourselves we know that quality comes first and we are committed to delivering the best game possible."