Perhaps this thread should be made into a sticky at the top of the forum. I keep seeing the same questions over and over, so here are the answers.... 
1) Correct, there is no longer an Apple brand back cover for the iPad Pro.
2) Yes, the new iPad Pro 10.5 is slightly larger in dimensions than the old iPad Pro 9.7. That means cases from the old 9.7 will NOT fit the new 10.5.
3) The new second gen iPad Pro 12.9 has a larger camera with flash, and the microphones have been moved to a different location. So cases from the first gen 12.9 will NOT be 100% compatible with the second gen 12.9.
4) Yes, there is a new Apple Smart Keyboard for the iPad Pro 10.5.
5) No, there is NOT a new Apple Smart Keyboard for the iPad Pro 12.9. The previous one will work fine with the second gen 12.9.
6) There is NOT a new Apple Pencil. When using the Apple Pencil with the new iPad Pros, they will have better latency due to new screen technology.
These are just some I have thought of. Feel free to add more.
1) Correct, there is no longer an Apple brand back cover for the iPad Pro.
2) Yes, the new iPad Pro 10.5 is slightly larger in dimensions than the old iPad Pro 9.7. That means cases from the old 9.7 will NOT fit the new 10.5.
3) The new second gen iPad Pro 12.9 has a larger camera with flash, and the microphones have been moved to a different location. So cases from the first gen 12.9 will NOT be 100% compatible with the second gen 12.9.
4) Yes, there is a new Apple Smart Keyboard for the iPad Pro 10.5.
5) No, there is NOT a new Apple Smart Keyboard for the iPad Pro 12.9. The previous one will work fine with the second gen 12.9.
6) There is NOT a new Apple Pencil. When using the Apple Pencil with the new iPad Pros, they will have better latency due to new screen technology.
These are just some I have thought of. Feel free to add more.