This announcement does not have too much information to go on, but Tranquil PC is launching their MonoOne all-in-one PC at the end of the month. It will be fanless and milled out of solid aluminum. This solid chunk of metal helps keep the device cool. It is a large mass of metal with fins cut out of it for extra surface area.
Specifications are not listed. We do not even know the screen resolution, processor, drive, I/O ports, or RAM. Current speculation is that it will use a low power Core-level CPU. It looks like it has a removable metal stand and a VESA mount for the wall. In fact, it looks like the stand is attached by the bottom two wall-mount points but I cannot see for sure.
The MonoOne launches at the end of September.