First of all, one of the French sites says that we should see the new iPads introduced on October 15th. Furthermore, French site NWE says that the Apple iPad mini 2 will offer buyers the chance to purchase the 7.9 inch model in Space Gray. Pictures of a leaked Apple iPad mini 2 casing wearing that very color, was found on NWE. This is also one of the new colors available for the Apple iPhone 5s.
Besides the new color choice, which replaces black (yes, Space Gray IS the new black) on Apple's color spectrum, the photos below show the Apple iPad mini 2 in the more traditional White & Silver colored casing.
We know that October 15th can't get here soon enough for many of you!
Apple iPad mini 2 casings in White & Silver and Space Gray
source: NWE (translated) via 9to5Mac