PS4 will support it I think, but it will be optional. Haven't Sony confirmed 1st party titles won't use it? I suspect the likes of EA and Activision will want to implement it.
However, as Persona 4: Arena confirmed, PS3 can use region locking on games, however in the whole lifespan of PS3, Persona 4: Arena is the first and currently only game to implement it.
If people stick to their principles on this and kick up enough of a fuss (i.e. don't buy titles that are locked in that way) and they realise they're bleeding money as a result, it'll soon stop on PS4 and in Xbox One's case it'd soon be patched out. But only if it hurts them financially. At least if it's optional on PS4. the message can be sent out through voting with your wallet.
RIP Dad 25/11/51 - 13/12/13. You will be missed but never forgotten.
