Sorry, Kapitan, as I assumed, PMDG has confirmed the 777 to be FSX exclusively.
http://forum.avsim.net/topic/372169-...7-information/
FSX will also get a new version of their 747.
Both planes seem to use plenty of the code for the 737NGX, and had it adapted only to the different characteristics and graphics of the planes. The 737NGX was a completely new software development from scratch, and the 777 now seems to benefit from that work - that might be the reason why it is coming so much faster.