"Hey Siri" support and possibly wireless charging case alongside AirPower charging mat.
Apple Announces New Mac Mini Starting at $499
“People love Mac mini. It’s a great first Mac or addition to your home network, and the new Mac mini is a nice upgrade packed into an incredibly compact design,” said Philip Schiller, Apple’s senior vice president of Worldwide Marketing. “With the latest CPU and graphics, faster Wi-Fi, two Thunderbolt 2 ports, OS X Yosemite, and starting at just $499, the new Mac mini is the best value ever.”The new Mac mini comes with 4th-generation Intel Core processors, Intel Iris and HD Graphics 5000 with up to 90 percent faster graphics than the previous generation, PCIe-based flash storage, 802.11ac Wi-Fi, and two Thunderbolt 2 ports. Apple also claims it's the "world's most efficient desktop".
The new Mac mini begins shipping today.