I think this my first time I see a leaked source code for a closed source product before its lunch. Viva battlefield 2042. Cheats will be available in a time record.
The Half-Life 2 leak happened way before launch (13 months) and there were a lot of changes when it actually released. 2042 is much closer (4 months) if the release date keeps.
The HL2 leak was super cool and practically a behind the scenes copy. Untextured walls, unfinished levels, all sorts of fascinating test areas. Great reference.