In October it will have been one year since the last major feature update to FCPX.
If it takes any longer I'll expect GrubHub integration so FCPX can order lunch for my clients while I continue editing.
I think I read somewhere that Apple is waiting on the new Mac Pro to be released before they come out with a major update for FCPX. So it might be just bug fixes we'll see until then.
Some are speculating that. I could see another FCPX update sooner if the MPs don't come 'till late December.
Some have speculated a big feature release followed by a released focused on GPR related things for the MP.
The rumor mills are very quiet.