This is a rumors site, and yet Fuji has confirmed a big chunk of their future lens roadmap, so those aren't really rumors anymore.
We need to return to idle speculation, poorly sourced rumors, and spurious claims to live up to our calling here.
Now that Fuji is releasing the 33mm f/1.0, which is sure to be a huge hit, tour d'force and spark demand more more faster lenses the obvious question is: what comes next?
I've given this a lot of thought and I think a 66mm f/1.0 is the logical next choice. Super fast lenses have most often been offered in 50mm to 58mm full-frame equivalent size, going all the way back to the film era. The second most common speed is moderate tele, or "portrait lens" as many people refer to them. Fuji has already dabbled in this realm with the 56mm f/1.2 (84mm equiv). And of course there is the 90mm f/2 (135mm equiv.)
Which means one of the few prime lens "holes" in the Fuji range is still the classic 100mm / 105mm range, long favored by Nikon. Currently they have the highly acclaimed AF DC 105mm f/2 (a $1200 lens), with "Defocus Control" as well as the even more expensive ($2200.) AF-S 105mm f/1.4E ED, for those wanting even more speed.
A 66mm f/1 would be a step above even this top-of-the-line Nikon, and might finally end the bokeh wars once and for all, as well as filling one of the few remaining holes in the Fuji lens lineup.
The 100mm lens has long been a focal length where manufacturers show off. The Zeiss Contax (C/Y) 100mm f/2 was claimed as the sharpest lens among a collection known for sharpness back in the manual-focus film camera era. The Leica Sumacron 90mm f/2 is a superlative lens, dubbed "The world's highest-performance photographic lens, period." by multi-brand lens reviewer Ken Rockwell.
What better way for Fuji to put the competition in their rightful place than a 66mm f/1?