"yeah guys, wii u version of project cars looks great" -slightly mad studio -> ended up cancelling project cars for wii u
"we at ea are creating a new strong relationship with Nintendo for the wii u" - ea -> ended up cancelling crysis 3 for wii u despite it being complete
There are many things that could go wrong. Just because someone says that something is near finished does not mean it is so. They could just be saying it for publicity. The only source of info for claiming their game is complete comes from themselves. That is nowhere near promising. All this could have been fixed by giving so much as a screenshot.
Thats not same like saying "it’ll come out this year".
Also remember Tantalus announced ZombiU port only around 1 month before was released!?