It's a good point Kevin.
I have tried a few models in the demo version and although some worked, most had a problem somewhere, whether it be with lights or animation etc.
As the planes are all 3rd party freeware aircraft, we can't give you a definate answer as to when the fleet will be compatible. I guess we will just have to wait and see what happens when the game is released and see how quick the freeware developers are giving us updates, I suspect POSKY & IFDG will be the first to get compatible products as they are the biggest of the freeware developers. This said, PMDG are quoting 6 months to get an update ready for the 747, with a completely new version of the 737NG following about this time next year!!!!! It may be a while before we see the entire fleet converted to FSX.