did some extra snooping, now this might not be 100% accurate but apparently the main difference is you get to carry on after Olga and...........
1. Title screen has a new look.
2. Codec visuals are more distorted.
3. Olga switches on a bright spot light so you can\'t see her.
4. Screen steams up when you go from the wet outside to the dry inside.
5. USP can only be obtained after finishing Olga.
6. Slightly changed dialogue, explaining more.
7. normal grenades!!!
8. It\'s all in English.
9. 20 minutes or so extra playing time.
10. You have the camera so you can take snaps of dead guards!!
11. Boss energy bars are different
some spoilers were mentioned but left em out

Can\'t wait!