The same as whatever the last-gen consoles are

I doubt Ubi will want the WiiU version to be lower than 720p, so considering the X1 version is 792p i'd bet on the WiiU being 720p with graphical cuts.

Well I'm surprised no one said the obvious which is sub hd and 30fps with dips ... If the PS4 is struggling to get 1080p with watch dogs then I highly doubt the WII U will fair decently in performance even with cutbacks in technical feats such as lower draw distance, no tessellation, lower texture resolutions and no anisotropic filtering to boot.

500~650

Somewhere in that area is my guess.

However, the delay for this version might partly be to differentiate it from last-gen and maximise its potential which could be as high as 720p. All 30FPS of course.

720p. Well optimized. WiiU is not THAT much behind X1.

 What were the differences in ACIV?

As long as the frame rate is locked at at least 30fps, I don't even care if it runs at 420p.

Even if Wii U could put the maximum resolution (whatever it may be), will it even be worth it? This type of game on Wii U is hardly comparable to what it can potentially financially achieve on other platforms.

720p and 30fps

If it were better optimized I think it could do more, but you can say the same thing about the PS4 and Xbox One versions.

It wouldn't be half bad, or did you mean 480p?

720/60 but not so pretty...