My only concern is that SE forces people to link their PSN handle to FFXIV on the PS3. I'm trying to figure out if this will be problematic if users change their name for the PS4. I suppose you could always log in under the old account.
As for the OP's question on the PS4 release, all we know so far is the game won't come out for at least a year. I'd imagine it will come out with an expansion. It's far too early to pre-order at this time.
You can always make multiple PSN accounts.
I think you've been smoking the Moko...
Angus of Cerberus (retired)