(Shrug) It's common for less-than-foundation-level models to be released every so often. This is done in order to provide new options, features, pricing, service levels, APIs or whatever that aren't yet incorporated into the main model, or that are never intended to be.

Just a consequence of how much time and money it takes to train a new foundation model. It's not going to happen every other week. When it does, it is reasonable to announce it with "Announcing our most powerful model yet."