Looks like it wont open until the end of 2011.
Here are a couple of articles in Spanish from the local press
La Comunidad quiere acelerar las obras del aeropuerto - La Opinión de Murcia
El aeropuerto de Corvera entrará en funcionamiento a finales de 2011
One of the historic problems that affect San Javier is the air base , with the air force getting runway priority at certain times of the day.
Whether Corvera will take over from San Javier remains to be seen - AENA calls the shots at MJV but Corvera is private . Should be interesting to watch developments