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Last month, Gurman reported that the next-generation Mac mini with the M4 and M4 Pro chips will feature the first major design change to the machine since 2010. The new Mac mini will apparently approach the size of an Apple TV, but it may be slightly taller than the current model, which is 1.4 inches high. It will continue to feature an aluminum shell. Individuals working on the new device apparently say that it is "essentially an iPad Pro in a small box."
In the 2020-2021 era Gurman went on for multiple accounts of "half sized Mac Pro" that never appeared. Perhaps, his source was trying to describe the Mac Studio as a "half sized Mac Pro" at one point. But that source has fundamental spacial reasoning skills deficits in that case. The Studio is smaller but it isn't near 'half' the size. And the M-series Mac Pro is resoundingly incorrect as being described as being 'half sized'. It is the same size. Gurman was
WAY off in the weeds on that one.
From the description of front ports matching the Studio , there is decent chance the AppleTV reference is more so about the more cube-ish the AppleTV is compared to the much wider&deeper classic Mini's 7.7" square footprint
The Mini and the Mac Studio share the approximately same 7.7" square footprint. Since loosing sockets here, it is pretty likely that part of the width across the box is disappearing also. So, like the AppleTV, the updated chassis will be less wide (and deep) just as the AppleTV is. But probably not starting from the AppleTV box and making it slightly bigger. Decent chance that this is starting from the Mac Studio baseline design and making it smaller. Dump the SD card on the front. Dump the USB-A sockets on the back. Make it less wide ( e.g., 1" , maybe 2" ). Reduce the air exit vent on the back (don't have to cool an Ultra at all) and shave 1" - 1.5" off the height.
If largely remove aluminum top and throw some colored (recycle .. saved from the ocean) plastic on top and the top would be plastic-like material matching the AppleTV , but not really AppleTV baseline design. ( can move the radio Wifi/BT antennas to the top. Instead of the bottom of the device and probably get better signals out).
In short, I suspect the "AppleTV" is probably at best misguided ( and decent chance just plain wrong) of a notion to connote here. A 6" x 6" footprint isn't going to be "like a AppleTV" sized footprint. But 6" would be much closer to a 1.85-2.5" height ( approx 3:1 ) than 7" is to 1.41" height ( approx 6:1 ). [ Apple TV being 3.66" to 1.2" , so an approx 4:1 the width to height ratio would be closer to AppleTV's. Not the actual size. ]