Damn, 10 minutes ago I commented on not pre-ordering. Now I'm struggling myself, lol. This looks very good, and from all the tiny tidbits you can see, they overhauled the RPG systems (weapon stats, perks/attributes).
Keep strong. Preordering fouls the business and it won't make it released sooner.
Could you expand on the things you see are different, though? I still see the "makes target catch fire" mod, spotting weaknesses, sandevistan and cold blood. What do you see that is different?