A MacRumors forum poster contacted the store and was told that the information "comes from apple or reliable sources".
Here's the Google translated product description which indicates that the new Mac mini will feature Intel Iris graphics, 802.11ac Wi-Fi, Gigabit LAN, USB 3.0, and more:
The Apple Mac mini features a sturdy and above all very compact aluminum housing. Despite its small size, the Apple Mac mini comes with powerful hardware. The Mac mini is equipped with the latest Intel Core i7 processor from Haswell series. This processor is obviously faster than its predecessor, but also uses the powerful Intel Iris graphics. The latest Apple operating system, OS X Mavericks, works very user friendly and communicates seamlessly with other Apple products. So for example you can just get iMessages on your Mac mini. In addition, OS X Mavericks a very secure operating system, you have (almost) not suffer from nasty viruses. The Apple Mac mini with the latest WiFi standard 802.11ac. This will make use of a high speed Gigabit LAN. You are here obviously compatible 802.11ac equipment needed. If you ever want to expand the memory of the Mac Mini, this is easily done by turning the black plate on the bottom and then add additional memory. The Mac Mini has many connections. He is equipped with HDMI, USB 3.0, FireWire and high-speed Thunderbolt connection.