People are forgetting that Vueling is a subsidiary of Iberia which is also part of the IAG group.
Some of the surplus A319/A320 being sent to them from the BMI/BA deal.
It seems strange that Vueling makes an announcement to start Barcelona from Cardiff just as bmibaby say goodbye.
Ease Vueling into the market before the announcement of bmibaby is now Vueling.
It's a long shot but could happen