The Mini_ITX H77TN and B75TN are both with Intel's AIO specs. The also support LGA 1155 Intel processors, two 204-pin DDR3 laptop DIMMs, 4x PCIe slot, and mSATA support all with a 17 cm x 17 cm x 2.3 cm design. The ultra low profile allows DIY builders to include this board into very tight spaces with the help of creative cooling solutions.
While All-In-One (AIO) PCs and Mini-ITX are not new, you can now start a DIY project within the AIO spec. I am sure we will see the GIGABYTE H77TN and B75TN used in a number of interesting mods as well once they are available.