Just like nailers now dead comment stated, this is still id Tech 3 and the games are from 2001 and 2003 respectively. While probably a little bit better than Quake 3 it's still old. For age reference, the original "Call of Duty" was based on id Tech 3 and released in 2003. (Wolfenstein: Enemy Territory != Enemy Territory: Quake Wars)

This is huge. They open sourced quake ages ago and that spawned a billion games and game engines. Can't wait to see what people do with this one.