American Express said it would expand its lounge network by opening new Centurion Lounges in Newark, Tokyo and Salt Lake City.

And he’s starting to give hints of just how exactly he plans to lure more of them to the fold, announcing on June 16 that the company will implement a big upgrade late this summer or in the early fall to its Platinum card.

American Express is making its biggest update ever to its Platinum credit cards. The changes will bring new travel, dining, and business benefits, and expand lounge access with new Centurion

If past card revamps are any indication, the annual fees on Amex Platinum and Business Platinum will almost certainly see increases as part of the planned changes. But just how high could they go?

The company’s U.S. consumer and business Platinum Cards are slated to get “major” updates “later this year,” American Express said.

American Express (NYSE: AXP) is announcing today major updates coming to its U.S. Consumer and Business Platinum Cards® later this year. With these updates, the company is making its largest investment ever in a Card refresh.

The issuer said that The Platinum Card® from American Express and The Business Platinum Card® from American Express will be receiving a full revamp later this year. Chase and Capital One are also updating their premium cards, so the competitive landscape may shift quickly.