They as a business have to give there clientele advanced notice of these changes to help transition everyone to no disrupt there TV viewing.
MAG units by design will only ask for this information when the switch is turned on and you are prompted just before the Authentication bar loads, it will not load otherwise.
AVOV units can already do this under there "Use Credentials" tab in there server info
PVR.Stalker I believe all you have to do is enter your donation # in the donation field and it will know that it is also being used for Username/Password, if not a new version should be released shortly.
The only thing I'm unclear of is the STB Emulator, I would think that it would act like a MAG because that is what it is emulating in the first place, but I hear a new version should be coming shortly.
Good luck to everyone come February 1st, make sure you have that donation number otherwise you will be without television.