Game spot have a review of the demo there showing at E3 not sure if that link will work as in on my phone but it says that you can change your red dot sight to acog by twisting a thing on your sight

http://gamespot.com/6315438

awesome vid i think in the second screenshot that soldier is the one that passes you the mag in the trailer i loved the info about the Kriegler stuff

nice find mike, i think the demos sound pretty awesome considering the game is only just out of alpha testing