I am not going to elaborate on all the changes, but the "hot" topic seems to be the clarification of the BLARGE when the OOB line is involved.
Cliff notes version : IF the defender's foot is on or outside the OOB line the defender cannot have legal guarding position, therefore if contact occurs it is automatically a "Block."
You can read more about it at this location:
http://www.nfhs.org/sports/basketball_interp.htm
I'll let others explain the 4 and 2 Free Throw change.