I think you're missing that the design is such that server modules from different manufacturers can be plugged in. This levels the playing field unlike other server architectures which are exclusively Intel. Look to hear for tight integration with OpenStack.
So you buy a rack, a chassis with slots for CPU boards and some CPU boards. They can theoretically all be from different vendors. I doubt that many will buy the chassis from one vendor and the CPU boards from another vendor. The big issue will be "which vendor do you call if the assembled configuration does not work properly?"
In practice, I think anyone buying these systems will buy a chassis and CPU boards from the same vendor. That vendor can supply CPU boards based on x86_64, ARM, ..... but the buyer will buy all the same CPU boards unless there is a valid reason to mix. He may particially fill the chassis and then populate later but they will all be the same architecture. Purchase price is not the only factor in determining cost of ownership.
The processor agnostic design will be bought by many who just want an x86 microserver and these systems will be the cheapest systems. It does less to level the playing field than you would like. Someone spending corporate money will have to have a reason to buy anything other than a chassis containing Intel or AMD x86 boards. The buyer already has SW and training investments that can be levered with them.