As far as new featuresattributed to theSPECIAL stats go, I've found some stuff. With CHARISMA you get something called "Companion Nerve" witch gives your companions buffs to damage and armor. With INTELLIGENCE, if you have INT lower than 4 you will get the "dumb" conversation options. With AGILITY that will affect how fast you draw your weapon, how fast you reload, and how fast your run speed is (also you do not have a penalty for running with a one handed weapon, only two handed ones). LUCK will affect "Enemy Mishaps" i.e. enemy shooting wide, grenades blowing up early, etc.
Comes from the guy leaking info about the Strategy Guide. I like what I'm seeing.