Seems that only the left over XGs with the wire backing would have the full synthetic media. I'm assuming Fram will eventually switch all XG Ultra models over to the new media ... time will tell.
FWIW the new box still says "Dual layered synthetic media..."
I just received (11/16/2021) my Amazon shipment of 3 filters:
XG3980 date code A10983, box © 2019, can © 2017, box has "Durable Metal Screen"
XG9100 date code A11411, box © 2019, can © 2017, box has "Durable Metal Screen"
XG10575 date code A12641, box © 2020, can © 2019, box has "Perfect Seal™ Gasket" in place of "Durable Metal Screen"
The XG10575 I just pulled off was in the new box and has date code A11863 received 08/10/2021 from Amazon
The other XG10575 I have on the Buick also in new box has date code A11473 received 07/01/2021 from Amazon
For kicks and giggles I looked inside the filters. ALL of them have a metal screen.
Here are pics of the XG10575 date code A12641: