So up to now at least, here is when the Mac mini will supposedly get upgraded, according to Mark Gurman of Bloomberg: this week.
    
The mini is Apple's desktop computer-that is to say, a gray, boxy, relatively small box-of course, sandwiched in between the consumer iMac and the professional-grade offerings from the company.

This mini will reportedly shrink almost to the size of an Apple TV set-top box. There will be two ports at the front and three on the back in some of its models. It is also said to be the first Mac that will make use of the ray tracing graphics technique. Apparently, sources told Gurman that it is "going to be the most impressive Mac yet to use Apple's in-house silicon.".

There are reports that the two new Mac mini models will be part of a host of new Apple devices expected to be announced this week. The lineup is going to include a 24-inch iMac, a 16-inch MacBook Pro, and two different configurations of the 14-inch MacBook Pro, all running on Apple's M4 chip.

One more interesting fact: Gurman says the smart home display from Apple is reportedly the size of two iPhones placed side by side, with a small base like that of the iMac G4, which has speakers.