Ars Technica:

With the newest Mac mini, gone is the two-core, four-thread 28W Haswell processor with up to 16GB soldered RAM. This machine boasts Coffee Lake processors, either a four-core, four-thread Core i3 base model or the six-core, 12-thread Core i7 chip as found in my review system. This processor is paired with up to 64GB socketed, user-serviceable RAM. Storage has also been shaken up. Instead of a range of hybrid and SSD options, the new Mac mini is all SSD, from 128GB to 2TB. There are four Thunderbolt 3 ports, one wired Ethernet port (usually gigabit, but optionally upgraded to 10 gigabit), an HDMI 2 port, two USB 3.1 generation 1 ports, and a 3.5mm headset jack.

It turns out that hardware can get a lot better when you wait four years between upgrades.

The mini is a much loved little box.