BAA Strikes
I'm sure that BA will have a few flights from Cardiff if the strike goes ahead, Probably some 777 and 747's. There is a sheet for volunteers at Aviance that are willing to be rostered on if the strikes do materialise.
BmiBaby
I don't think they will do a BCN this summer unless they decide to chop the polish routes completely. I can't see why they didn't do this year with the Polish routes as they did with the Geneva last year.
Do a once weekly flights and then increase the following year if the loads are good enough. 5 weekly flights to Poland from Cardiff is bit of a jump from 0.
I wonder if they will be bringing back the Ibiza this year? It seem to do very good last year.