A couple of early thoughts:
There is a lot going on in every map - birds buzzing, paper flying all over the place. I can't tell if I like this or it just flat out annoys / distracts me.
The gun sound effects still suck bad. Not sure what happened. Everything else is really polished - I mean the delta ops guys are wearing oakley gloves and anon goggles for Christ sake.
I like all of the new custom-ability although for gamers new to COD its must seem pretty daunting.
Support > assault package. Surprised by the number of offensive oriented packages that are available via support.
Explosives are not as effective and most of the shotguns are worthless.
Kill confirmed is a retarded play mode - as suspected it encourages campers and makes every map a CQC battle.
Elite is a fucking disaster - still not working after 3 days. Waste of $$$.