Let's be real here, everyone misses Microsoft Sam so the only next logical step for Microsoft would be to re-introduce him to the masses. Let him be the new cortana who talks to you and helps you with everything.
Make it so that voice chat is now only your voice transformed into MS Sam's and everyone sounds just like him.
I would just continue the brand and call it the Xbox elite . Make an elite headset as well and package the elite console, controller, and headset together for 499.