We've known for quite a long while that Nintendo is prepping the Nintendo NX for launch early next year. A report from Yahoo Japan suggests that Nintendo is actually working on two separate hardware projects, the second of which is a handheld with codename Nintendo MH.
The report, partially translated by MyNintendoNews, didn't reveal any info regarding the MH's design, specs or release date.
The Nintendo NX is scheduled for release in March 2017. Nintendo clarified several times that it is a brand new concept and that it is not meant as replacement for the Wii U or the 3DS. Perhaps the MH will also be a brand new concept that stirs up the handheld consoles market. Or perhaps the MH stands for Mobile Handset?