The developers of “Revision” commented on how they made this happen:
On the one hand, we would love to get Revision out the door ASAP. On the other, we’re committed to making sure that we can release it and maintain it in the best possible way, and with as few stumbles as possible.”
It’s a surprise that Square Enix is not only allowing the fan-mod to be published, they are even promoting it. So why is Square Enix being more helpful to this fan-made creation than it has the others in the past? Maybe it’s because at Square Enix, they have an ‘ask them first policy’. If you want to use their content, you should ask first before creating anything, and maybe, just maybe, Square Enix will end up supporting your venture.
Whatever the reason may be, Revision is a phenomenal mod. It doesn’t just update the graphics of the 2000 Deus Ex, but also improves the AI, fixes bugs, and even rebalances the game. This should make the game worth going back to and trying out, since the mod is free on Steam. Deus Ex: Game of the Year Edition is only $6.99, too. So even if you don’t have the game, now is a good time to buy. And with Deus Ex: Mankind Divided releasing on February 23, 2016, it would be a nice way to get into the game series.
Source: Kotaku, Macworld, Gamespot, Polygon, Techno Buffalo, Square Enix Term and Service