In a recent interview with the Nikkei, Nintendo president Satoru Iwata revealed that Nintendo will be remaking more smartphone games on the Nintendo 3DS. Iwata added that the company will also be remaking old Nintendo games for the handheld. The games will be low-priced, going for a few hundred yen (a couple of bucks).
Thanks to Kotaku.
And when they say, remake I think they're serious. 3DS doesn't support Unity so porting is kinda hard for games that use it.