I don't think anything else has been heard since that press release. Sadly I think it's one of those things.

I suspect your best option is pick up a copy of the Just Flight boxed version - if you shop around you shouldn't need to spend much more than a tenner - and IIRC you can get an FSX patch, which you certainly won't for the PSS release..

You could also drop a note on the Just Flight forum. As they publish several PSS titles, they may know of any progress, or whether PSS is gone for good.