As somebody else has already stated, these model numbers are already in use, for the old and new style Mac Pros, the Mac mini, and the iMac 4K and 5K.
It is unlikely that model numbers would be reused for different products.
Meanwhile, Apple can and does release spec bumps without new model numbers, e.g. the 2015 and 2016 MacBooks have the same number, and the 2008-2011 MacBook Pros 13" all have the same number too.
So, assuming this registry filing
is accurate, we could see:
- Updates to every single Mac.
- The MacBook Pros aren't listed because they have the same model numbers and ship with the same OS as the 2016 models. The other Macs are shipping with Sierra for the first time, thus requiring re-certification on this cryptography register.
- The cheese grater Mac Pro come back temporarily until the promised new Mac Pro arrives. Lots have pro users have been calling for this.
- A new keyboard with Touch ID to go with the updated iMacs and Mac Pros, OR simply a new Smart Keyboard for a new iPad Pro.