Mistwalker? Please be The Last Story 2!
I know, right?! That would be great!
Silicon Studio developed the Bravely games on the 3DS. They've developed a few other games of note in their past as well for mobile and other platforms (such as 3D Dot Game Heroes).
But, their middleware is fairly extensive and interesting. Bloodborne used some of their products for its game engine. More interesting/important, Square Enix has a likening with their products using it in Final Fantasy XV and at least going back to Gunslinger Stratos. But, it does make up portions of their Luminous Studio Engine. Coupled with publishing their Bravely games, some good things could be cooking up since Silicon Studio said they will be doing Nintendo NX things.
Speaking of which, here is the quote from the slide:
PlayStationVRやNintendo NXなど新規ハードウェアも今後登場
With the Google translation:
Also appeared in the future new hardware such as PlayStationVR and Nintendo NX
I figure they mean "will appear" or "also appearing" on the Nintendo NX and PlayStation VR, but that's what needs checked.
But, to me, it seems either they'll be having their middleware for use for Nintendo NX, or they have something in mind for development on there.