Some configurations of Mac mini and Mac Studio, which are marked "Currently Unavailable" on Apple's online store, are causing long lead times or are outright unavailable. This indicates a potential for a desktop Mac refresh. So far, Apple's updates to the M5 chip generation have mainly been portable products. The desktop Mac is the only one not yet updated to the generation. If you need a specific configuration, check the Apple Store itself or other retailers with their own stock allocations of Apple's hardware.