The developers at Microsoft spoke about the next generation in console at their E3 Conference. Some exciting points to take away includes shortened loading time, being able to play where you want regarding the cloud saving, and better frames per second.
They topped off the conference by announcing Halo Infinite as the launch title for the next generation console coming next year in holiday of 2020.
Source for video: Gamespot
The pre-order bonus is Terminator: Dark Fate characters.
Sources for videos: Kotaku and Gamespot