GOT DENIM YESTERDAY ! YAY!
Had to use the Lumia Recovery Tool (the one from Microsoft, not the Nokia one), download was 1.79GB.
Entire process went smoothly: had to re-enter credentials for Microsoft account, wifi and other email account but that was expected. Last backup was restored successfully, my Start screen is exactly as it was before upgrade, and all apps got re-downloaded with no problems.
Phone is RM-985_1000 from Fido, Qc, Canada
OS version is now : 8.10.14234.375
Firmware is now 02040.00021.15063.02001
Lumia Camera now has Rich Capture and starts faster than before from the camera button; haven't had time to check out other stuff - anything else I should be keenly aware of?
Of course, Seems Faster!