Apparently in development since at least May 2015.

Mindy Liang, a 3D animator at XPEC Entertainment, has listed a “Knack II” on her LinkedIn Resume.

According to the listing, she started work on Knack II in May 2015, working on “animated 3D character motions and cutscenes for PS4 system.”

In addition to having developed its own titles, XPEC Entertainment is also an outsourced developer working on certain aspects of Final Fantasy XV. If Knack II is actually a thing, this may or may not be the case.

The listing has since been removed, but can still be caught in a Google search.

Knack was a PlayStation 4 launch title developed by SCE Japan Studio.

Thanks, NeoGAF.