No mate no lockups as yet. Quite impressed by the load times for the size of the map though.
Mine was fine for the first assassination, then on leaving for the second I froze up at the loading screen requiring me to hard reset the power on the PS3 which was quite scary.
Since then I've had three freezes at completely random times requiring me to power off the PS3 but at least it responded to the power button and actually shutdown unlike the first time.
I've now put it down and won't be touching it till its patched.