Speculations asides, seeing LP page, the last patch for Falcon 4 was on January of 2008. And the last oficial new was a "Happy 2009".
Which would mean they have all 2008, 2009 and half 2010 working on something, asuming they are working
. With all that time they should get an idea that they still have for a full year, or more, of work to do. It would be nice to put a simple official news saying if they are working and on what, and then clarify that they will be absent for another long time until they have something tangible to show.
I understand they donīt want to create hype so early, and share their point of view, but being "disconnected" for so long gives room for pesimistic beleives that they are noh longer in business. And i still hope thay are working for and improved version of Falcon 4.