There are rumors floating around the Internet that the development of the next-gen Xbox is already at the stage of GPU production. I hardly think so, but I do agree the next Xbox will have BD drive and an improved version of Kinect 2. I doubt Microsoft will do anything radical to the used games, but the time will show.
The new console's estimated release date is sometime Fall 2014, which is only half a year short of expected Xbox 360's life cycle (10 years).
Check out the full article here: The Next Xbox Will Play Blu-Ray, May Not Play Used Games (And Will Introduce Kinect 2)