I dont think its been specifically said that its asscreed people are just connecting the dots.
There was a report from play testers saying the broken games will continue this holiday and on some ign podcast i think it was they casually mentioned theres a big title supposedly broken.
Personally my guess would be fallout 4 before asscreed.
Unity got crucified for being buggy,and I dont think ubisoft will make that mistake again.
Bethesda on the ither hand gets their broken games swept under the rug and never get chastised for it so why would they change?
Although who knows it could be halo 5,those new devs dont exactly have a stellar track record since taking it over.
Hell it could be all 3 or none of them its all just rumours and assumptions.