According to Nintendo Licensing Marketing Senior Manager Damon Baker, Nintendo is looking into bringing Unity to the 3DS.
The two companies already have a previous relationship, as Nintendo's worked with Unity Technologies to bring Unity3D to the Wii U. No doubt, the move was an effort on Nintendo's part to attract third party and independent developers to the console. The partnership entailed that the Wii U development kit would come bundled with a free copy of Unity Pro.
When asked about Nintendo's plans for the 3DS and Unity3D, Baker's response was as follows: "We've had those discussions and we are definitely looking at that.
"Our priority was to get the Wii U build [of Unity] up and done and ready. Because we need a test environment for it, it's taken a while for Unity to get finalized on Wii U, so that we can actually test against it. So that has been made available now and that is why we've got all of these [game] candidates waiting in the wings that are just going through the submission process at this point.
"Now, we can move on to other platforms and see how we can make those compatible, either with Unity or with additional middleware providers as well."
The 3DS isn't in the same dire situation as the Wii U in terms of sales, so Nintendo has the luxury of time to decide whether or not to bring Unity over to the handheld. The 3DS already boasts a large library of quality titles, but bringing over a couple more wouldn't hurt. Not to mention, this would allow Nintendo the chance to establish relationships with more developers and potentially court them to develop for the Wii U.