Played one game (thanks Jester) and it felt very sloppy and tedious. Not having all the rules memorized, I missed a lot (warlord traits, precision shots, look out sire on characters, wargear to mention a few). Rules seem to give the edge to shooting with the new rapid fire, overwatch, and reduced cover save for woods.
Overwatch is over-rated.
Pre-measuring everything (feels like cheating) greatly influences your movement phase (prep for shooting or charge)
Flyers do seem to be a mixed bag (agree with dropping down from 4).
Wound allocation (cc and ranged) will take some getting used to and will take some finesse to master
Big play on psykers and what they can add (Eldrad=yeah!)
No more "surprise" assaulting from infiltrate and outflank sucks
Fearless units not taking extra saves for losing cc is huge (rippers and scarabs rejoice!)
Glancing vehicles to wreck is shockingly easy (A10-A12 anyway)