The Zoom Instagib mutator, inspired by the eponymous mutator for UT.
The Bombing Run gametype, inspired by the Fragball gametype mod.
The translocator's new built-in camera option, inspired by the Translocam mod.
Canon Discontinuity: For Epic themselves and many people, 2003 never existed, and said game is a beta version of Unreal Tournament 2004 instead. It gets weird storyline-wise, since the events of that game (most notably Gorge being the current Champion and Malcolm breaking his team with Brock and Lauren) still technically happened.