NST just finished porting Super Mario Maker for 3DS. Working on two other first-party projects. Also beginning mobile development.
https://twitter.com/EADNinja/status/794597603388325889
While we don't have more information, this is rather big news. They've worked on Mario vs/& Donkey Kong titles for years now. Having another studio work on mobile development is also interesting, and lines up with what Liam Robertson reported late last year.
When it comes to blaming Nintendo for the shitty online functionality in the 3DS port, we now know whom to blame specifically.
Kyoto-Report also tweeted:
https://twitter.com/EADNinja/status/794592837585211393Nintendo and Vitei's project is 99% done. Waiting for NCL to decide release.
This is to be expected as Tank Troopers is supposed to launch later this year in Japan.