Heard somewhere 333's are supposed to replace 323's.
But then again, the fact that hardly anybody AFAIK hasn't complained about the 333s in Yorkshire so I think that perhaps they should stay there since they're doing a solid job.
Besides, the fact that Siemens (the predicted builder of Northern's new build) has a depot, granted for 185s atm, in Ardwick and perhaps the use of the Longsight depot just a few miles from Siemens' depot would make the 323s current stomping ground an appropriate place for a new build of EMUs to settle into life in Northern's fleet.
Well, that's my two cents on the subject, anyway.
