The report comes courtesy of Bloomberg's Mark Gurman, as reviewed by MacRumors, which suggests a refreshed Mac mini will come out in "the next several months" with a processor that's believed to be more powerful than the current M1. While Apple is yet to confirm the M1X, an earlier report from Jon Prosser cited the processor as one of the next big changes coming to Mac mini.
Prosser also claimed at the time that Apple was making a thinner version of the small desktop computer with more ports. The latest report now corroborates that claim, with Gurman saying we should expect a high-end Mac mini "with more ports than the current model."
Aside from the Mac mini, Apple is also rumored to introduce redesigned MacBook Pro models this fall, also reportedly powered by the M1X chip. The updated MacBook Pro announcement was expected to take place at Apple's WWDC event in June, although it didn't materialize.