The folks over at VideoCardz ahve got the first pictures of Gigabytes Z370 motherboards, they says:
Well, it appears Gigabyte made the biggest change to their design. We have three motherboards to share, starting with Ultra Gaming, this is a budget-oriented model in AORUS series. It lacks some of the features of AORUS 5 and 7 and the I/O cover is well, different. This model has two M.2 slots, whereas the AORUS 5 and 7 both have three. Each motherboard has three PCIe x16 and three PCIe x1 slots. The AORUS 7 has two ethernet ports and additional shield for one of the M.2 SSDs.
And no, you are not forced to use orange LEDs, you can change them to any color you want, or disable them altogether.
If you look closely, then you will notice that the packaging says LGA 1151.
Z370 Aorus Gaming 7
Z370 Aorus Gaming 5
Z370 Aorus Ultra Gaming