HDPLEX's smallest case yet is designed for mini-ITX and Thin mini-ITX motherboards and up to 75W TDP processors. With 6 heat pipes and such a thick aluminium armor, we have no doubt it's going to be efficient.
The H1 supports full height and full length single slot PCIEx1 or PCIEx4 expansion card. An internal custom made 19V 120W PSU will also be available.
The H1 will either come with an optical drive, a slim optical drive, or without optical drive. Design wise, it will be available with a silver or black (15mm!) aluminum brushed faceplate. All this for $179.
Update: Pictures with its cover on (it's quite a looker too).
Update 2: HDPLEX might also manufacture a NUC adapter kit. With AMD and Intel LGA / mobile / embedded / NUC capabilities, the H1 would be truly unique.
✓ Intel 1150/1155/1156/775 and AMD FM1/FM2.
✓ Intel G2/G3 mobile rPGA 988B and rPGA 946B/947 socket
✓ Chassis External: Width: 286mm, Height: 70mm, Depth: 222.8mm
✓ Chassis Internal: Width: 196mm, Height: 58mm, Depth: 207.8mm
✓ 2.5kg (including heatsink system)
Source: HDPLEX forum