The previous 35 Cron was in service for 16 years, not 16 months.
Even by Fuji's standards, they didn't update their Hasselblad HC lenses for at least 7-8 years, and that's after there had been 4 bodies and technological leaps and bounds in AF.
I may eat my words, but I also kind of doubt the announcement of a new X body until much later this year (maybe even spring). They need to market it with new lenses which were promised this spring... and it's upon us now. I don't think Fuji will just release a new body if PDAF is the only improvement. I know there's some magazine from Japan floating around with some general info, but really...