Hmmm...that reality enginbe looks sweet; especially the occlusion culling and wysiwyg editor (plus the other rendering perks!).
I just wonder: I bet that using such a middleware platform really makes modding a game built on it much, much harder (just look at games using Renderware). Which is a shame.
As for Retribution: all the more power to these people, but the story does sound contrived and hackneyed. I say keep the tech/gameplay ideas and get a propper writer to devellop a totally new story. Hell, the story doesn't need to be original (shit, a Schwarzenegger-like 'Commando' or 'Predator' will do nicely if the game play is there), but reading a story like this makes me think it will actively detract from the game.