Thanks for the NI User forum D-One who has found new hardware scripts inside recent Maschine update (2.8.3). According to the scripts it is a standalone device that features wifi module, airplane mode, flash drive storage and more.
Probably it will have same idea as MPC Live/X, when a device works as a standalone or as a controller when connected to a computer.
This could be MK4 or something else.
Here we have a bunch of screenshots from NI forum (in case NI decides to delete the topic):
Update: It seems as though the original Native Instruments forum post has been deleted. There are claims that these mockups are simply the result of some internal brainstorming and ideas, and will not develop into a fully fledged product.