Board only states support for 6th gen... One can only speculate. Time will tell. You could be pleasantly surprised, but I wouldn't hold your breath.
Here is the thing, officially they announced that they do, in october, but in practice so far its shown to be a mess, and like you pointed out, on the motherboards webpage, the board is yet to be compatible.
Newsroom Back to List
GIGABYTE Enables Support for Intel® Next-Gen CPUs
GIGABYTE’s 100 Series Motherboards Compatible with a BIOS UpdateTaipei, Taiwan, October 28th, 2016 – GIGABYTE TECHNOLOGY Co. Ltd, a leading manufacturer of motherboards and graphics cards,
is proud to announce support for Intel’s next-generation LGA 1151 socket processors. Compatibility
for the entire line-up of Z170, H170, B150 and H110 series motherboards are available with a simple BIOS update.
With multiple ways to update a GIGABYTE Motherboard users can rest at ease knowing that this update can be completed with little to no effort. One popular method for users to flash the BIOS would be to leverage the world renowned Q-Flash, this feature directly in the BIOS allows users to flash the firmware from a USB drive after they’ve downloaded the most updated BIOS into the flash drive.
Another alternative for users, if using a flagship motherboard such as the Z170X-Gaming G1 would be to flash their BIOS with Q-Flash Plus, allowing users to do so without the need to have the CPU or memory installed. These BIOS updates can be downloaded from the GIGABYTE website for users to flash on to their 100 series motherboards.
GIGABYTE engineers have tested and validated all GIGABYTE 100 series motherboards to ensure users will have optimal performance and compatibility for the latest Intel® Core™ Processors.
http://www.gigabyte.us/press-center/news-page.aspx?nid=1475But right now all i have is a beta bios and several testimonies with problems with these beta bioses, such as videocards that stopped being recognized or boot loops, with lots of people asking to use previous bioses.