WOW-ZA!!! As my 3-yr registration expires next month, I logged onto my FAA account - and - my registration now shows expiration in 2020! (I don’t think the’re ready, administratively, to re-register half the planet 
If your registration is expiring in the next few months, log into your FAA account, and be pleasantly surprised…
If you note on your registration page, you can either download or have the cert e-mailed. I opted for e-mail, and received the new cert w/the 2020 expiration w/in one minute.