Bugger, you had my heart going there...thought you were telling us that it had been released to us all. Hopefully it IS out by Christmas. Ever since I tried FSpassengers for FS9, I found that it was the only reason I was still flying in the sim. Can't wait until they let us get the X version.
Cool new features in it too, an AEROBATIC mode...cool!

'Dear passenger.....Brace ya self.'
I know on their forum they were discussing something about being able to use helicopters properly this time. I hardly ever find myself flying the whirley birds, but it was something I felt was missing in the FS9 version. Hopefully they were able to implement this in the X version.
Anyway, FSPX is on the top of my list for FSX addons. Hopefully it'll work ok on a vista 64bit system.