All 321's are not to go despite a previous poster suggesting so.
There will be a loss of 1 A321 from the fleet for next summer. Of the 2 BRS summer based A321's one will return to the lessor as it's lease runs out this winter, and the other will be located at LGW next summer.
Why 757's for BRS? BRS's runway length combined with the poor 'performance' of the Airbus make route structuring difficult. I think this last weekend again saw an enroute stop for fuel on one service because the aircraft wasn't capable of making it direct. The same route on the 757 wouldn't have been an issue - it's performance is just far superior. The Airbus has some good qualities, better fuel economy than the 757 for one, but if it can't cope with the routes direct it's a waste of time.
FCA want to operate Egypt routes from BRS, can't even contemplate it with a full A321.