OK, so you can't file yet, but hopefully it won't be too much longer (assuming you come under Rest of World of course).
I'm following this thread as although I'm EB1, I'm about to submit documents and enter the queue for an appointment at London, so keeping a close eye on how long it takes for everybody here to get their interviews. There doesn't seem as much info out there about employment based IV's as there is about family ones, so it's really useful info. Hope it's not long for everybody to wait. Good luck!