One additional tidbit from the T&Cs: looks like this actually will be a Mastercard World Legend card:
Interestingly, the T&Cs indicate that Priority Pass lounge access will be via showing the physical Citi card. (Cardholders can still obtain a digital PP card by registering with PP.)
I wonder if this integration is part of the new Mastercard World Legend tier.
I do recall that before Priority Pass was offered on the Citi Prestige, lounge access was via Airport Angel. There was an Airport Angel logo on the back of the physical Citi card, and access was by showing the card.