So this is the Metroid 3DS tittle that Next Level Games was making before working on LM: Dark Moon? If so...we've known about this for a while now :l; so this isn't any major news. If anything, maybe after their work on Dark Moon, Nintendo let them back on the 3DS Metroid Project but then recently decided to push that on the New 3DS (and in turn, making some changes on the game to 'push' that new version of the N3DS).
....Would it be out of place to guess Monster Games is working on a Metroid game? Retro has worked with them on both Country Returns 3D and Tropical Freeze, so it wouldn't be surprising if Nintendo assigned them to make a 2D Metroid game for the 3DS under Retro's supervision, while Retro makes a 3D Metroid on Wii U. But, Retro needed more man-power to get the game out for 2015/2016, so Monster's Metroid game might have been put on hold until the Wii U game is complete (then that coming out a year or so latter).
Those are just some guesses on what this rumor may mean :l. I would love a Metroid game on 3DS (just got my 2DS early this month and I love it

; the touch screen managing a fully writable map and item selection while exploring a great 2D world sounds awesome

).
Other M ruined the established character of Samus. That's why fans hated it. I actually enjoyed the combat system but my jaw dropped at the old school sexism of the story. It framed her as a baby crazy woman who was unwilling to do anything unless a man she had a crush on told her she could and was frozen in terror at the sight of a creature she had killed three times already.
Between that damn game trashing my White Wii's disk drive, what you are saying really bothered me when playing the game X(. I know this has been said to death at this point, but Samus is shown in every game prior to Other M being a strong, independent women that is something gaming needs (there are many strong female characters in gaming, like Jade from BG&E for example, but Samus was one of the very first ones). Then just completely undo all the stuff she went though in the past games....just to make her some....'doll' for a prick named Adam :l. .....Either way, Other M sucks for many reasons, but that has to be the
major one in my book

.