@evleaks has just leaked the list of upcoming Samsung Galaxy Note 4 model numbers. There will be 22 different variants of Galaxy Note 4. According to the leak AT&T variant of this device is SM-N910A. European variant and Chinese variant of Note 4 are listed as SM-N910F and SM-N9108W respectively. The list published by @evleaks indicates only two colors of Galaxy Note 4, i.e. black and white and according to the list AT&T variant of Note 4 will be available only in Black. Probably this is an initial list and Note 4 will be available in other colors like copper gold, glam red and electric blue.
You may see the detailed list of upcoming Samsung Galaxy Note 4 model numbers below: