Sightlight..
Look. I know you're excited, but here's one thing to note.
The 3DS has a dual core 268MHz ARM11. The G1/HTC Dream, the FIRST marketed Phone that ran Android 1.0, had a 528MHz ARM11. The MINIMUM required CPU speed for Ice Cream Sandwich and up is 1GHz.
You might be able to hack it to be able to run in some barebones commandline level aspect, but the usability is absolutely NOTHING like you are thinking you'd be able to do. You're not gonna run Dead Trigger on that thing.
I noticed you also referenced the OUYA at one point; That device has a Quad-core 1.6GHz Tegra3 ARM9, which is overclockable (as others with approximately specced Tegra3 devices have tried) to somewhere in the range of 2GHz without cooling, and thanks to the additional cooling fan in the unit, could most likely break the 2.5-3GHz barrier.
You also mentioned COD? you've misread. One of the former lead developers at Infinity Ward, Robert Bowling, Is creating an episodic prequel game in the leadup to a title Slated for release in 2015 called Human Element.
in other words, the 3DS won't run Android. No way, No how. Developing titles directly for the 3DS, however, is another story.