No, but don’t displays etc normally get updated on launch day rather than following the keynote.They’ve never had phones in store before release day.
Would seem a bit strange to have iPhone 15 signage around stores if they just have a bunch of older iPhones on display. Can’t imagine they’d sell many iPhone 14s that week.
Unless this is something different, immediate watch availability with signage relating to that (and AirPods) perhaps? 🤔