I suspect they will use MasterCard and VISA's own branding tiers, excluding (say) MasterCard World Elite and Legend or VISA Signature and Infinite.
Do most cardholders really know/care what branding tier their various cards have? Is it consistently printed on the physical cards? Scrolling through my Google Wallet, the Visa cards seem to have a tier branding, but none of my Mastercards appears to have one. Maybe on the back?
According to Google AI my AA Exec Mastercard is a World Elite with access to World Legend benefits.
(I thought it had recently been “upgraded” and wanted to verify)