Had a conversation with Polaris World customer services yesterday.
I asked about the airport and expected completion date and 2010 was mentioned (inevitable delays). However, other sources suggest 2009 is likely.
Apparently, San Javier airport has opened another runway in order to compete with Corvera, which should mean price wars bring prices down a little.
Some info here:
http://www.visit-murcia.com/corvera-airport.html