According to Nokishita Camera, the Canon EOS-1D X Mark III and WFT-E9 are already added to Canon’s latest product list, this means we will see official announcement within one month. Probably at the end of January to early February.
From Nokishita Camera:
“EOS-1D X Mark III” and “WFT-E9” are added to Canon’s latest product list. It may be added early because it is the year-end and New Year holidays, but reservations should start within a month if usual.