I think at the moment, no one really knows. Various rumours, probably started by people who want the bus at their base! I've heard BCN as an Airbus base, likewise I've heard they have been purchased as a bargaining tool against Future Boeing orders. They may be sold on or leased to airlines who want to expand, but can't get the deliveries quick enough!
I wouldn't mind a cabin crew table and a bit more head/legroom myself!
However, if the contracts on offer don't significantly improve, there'll be a lot of empty seats, 737 & 320!