A subtle "Special Edition" or "vanilla plus" version that adds bug fixes, replay value, extra functionality, content and atmosphere to the game, all while retaining that overall vanilla feeling, rather than the feeling of a vanilla game with various mini-mods tacked on as an afterthought.
This is Turncoat, the new ex-military trader who will be in v0.9 of Call of Pripyat: Special Edition.
When he arrives at the Laundromat in freeplay, he will offer to buy and sell only rare ammunition. The player will then have the choice to initiate a mini-mission where they can expand his inventory by investing money and becoming partners with him, and then convincing one of the other traders to become his new supplier. This means you will get to choose what sort of gear Turncoat will eventually buy, sell and stock.
Read this on GSC, Can't wait to see it!