https://arstechnica.com/gadgets/2023/06/the-macbook-air-gets-bigger-with-new-15-inch-model/

CUPERTINO, Calif.—It's common for Apple to refresh its various MacBook models more or less annually, but it's not so common that an entirely new screen size is introduced. That's what happened today during the company's WWDC keynote: Apple announced a 15-inch variant of the traditionally 13-inch MacBook Air.

It's something that's been rumored for years on end, and now after many false starts, the rumor has proven true.