The new 2024 iPad's Pro and Air have different physical dimensions to previous models. As such, fitted cases intended for earlier models will not be compatible with the new iPad models.
While Apple manufacturer folio keyboards and covers for many models of iPad, it hasn't manufactured fitted cases for iPad for many years. That said, there are many third-party manufacturers that offer compatible cases for iPad.
At launch, model-specific third-party cases and accessories will be limited in choice. Apple does some market third-party options; these can be found on Apple's website - and via the Apple Store App.