Exactly.If this is the case, then there are two reasons why Apple says it’s not compatible:
- More sales/money.
- Possible legal reasons (an angry consumer might sue Apple for any possible incompatibility with the new iPad Pro).
I suspect it's more legal than anything else. If you've been to any accessory thread in the iPad section there are any number of posts saying the slightest imperfection is an immediate reason for a refund. I'm guessing this is Apple's way to avoid the endless chorus of complaints that the case isn't perfect with their previous gen iPP or the old case with the new.
If they also sell a few more new cases to older customers along the way who don't check their old case with a new iPad Pro first...
Hey! Hey! Hey!

Like the 'P Diddy' of consumer electronics baby!