Earlier today a new Unreal Engine blog post revealed that a new branch of Unreal Engine 4.6 will support the Ouya SDK.
The fork (via GitHub, info below) of the Unreal Editor has built-in support for the OUYA SDK from Blueprints making OUYA Everywhere and OUYA In-App-Purchases available to coders and non-coders. The fork has documented examples for virtual controllers, in-app-purchases, and modifies the “Tappy Chicken” example project to work with controllers on the OUYA.