Wired
The Space Gray Magic Mouse 2, Magic Keyboard with Numerical Keys, and Magic Trackpad 2 are listed in the Apple Store as “finished as soon as they are out of stock.”
Products that appeared with the iMac Pro
When I checked in the Apple Store, I found that Space Gray’s Magic Mouse 2, Magic Keyboard (with ten keys), and Magic Trackpad 2 were displayed as “It will end as soon as it is out of stock.”
These products were peripherals that matched the body color of the iMac Pro, but they seem to be discontinued later than the iMac Pro.
Peripherals for the new 24-inch iMac and Mac Pro
Apple has a lineup of 7 colors that match the body color of the Magic Mouse that comes with the new 24-inch iMac.
The Mac Pro comes with a silver and black Magic Mouse 2 and Magic Keyboard (with a numeric keypad), but these cannot be purchased separately.
Source: AppleInsider, Mac Accessories / Apple
(FT729)
Source: iPhone Mania