According to the official site: X Rebirth represents a spectacular new beginning for the X series, offering loyal fans and newcomers alike a vast, vivid and extremely detailed universe to explore throughout the game. Varied gameplay elements such as action-packed space combat, detailed trading mechanics and high-speed space exploration with fast travel allow players to experience a truly unique space saga that will keep them hooked for dozens of hours. X Rebirth features a whole new user experience - it is easier than ever to start with, and remains as deep as fans expect it.
This genre has been pretty thin in the past decade, hopefully X Rebirth will scratch that space sim itch.
Check out the announcement trailer released by Deep Silver.