Could it be the Cry On proyect that got abandoned some time ago?

Wii U or XBO exclusive (or Wii U+XBO)? Iirc, Mistwalker or Sakaguchi had a falling out with Sony and SE, and doesn't want to work with them, right?

NX launch title.

Or just mobile.

That is true, I was just speculating based on this quote from the op:

According to the source: "He didn't reveal too too much about the game. Says it'll probably be a console release, wants the art style to be sort of sketchy while still being 3D. Visible pencil lines, etc." "He's said that it's probably going to be a current gen console release."

Bravely Third?

OMG!!! Excited since I beat The Last Story not too long ago and currently playing Lost Odyssey which is also almost done.

I really hope this comes to the Wii U. More RPGs please. (Plus the Wii U has a bigger install base in Japan compared to the Xbox One)
Only saying that cause of the apparent issues either Mistwalker or Sakaguchi has with Sony.
Fingers crossed.

It's probably the console version of Terra Battle. Either that or Cry On.

2nd picture reminds me of Crystal Chronicles/Bravely Default for some reason..

The artstyle totally reminds me of Bravely Default.

Bravely Third for PS4 coming.