The specs won't be equal. It will probably have an A9X or even, God forbid, Intel, while the iPad Air will probably have an A9. It will probably have 4GB of memory, while the Air will stick with 2.
But even so, I would still like to see pro software on the iPad Air 3 and iPhone 6s. I don't see why not.
I don't see the ipad pro sporting dramatically improved specs from the ipad.
For one, we already have problems with developers not fully supporting the latest hardware? Why lock yourself out of a larger user base by creating apps that require the full 2gb of ram and a tri-core processor to use? Many people are still rocking older ipads with A5 processors and 1gb of ram or less, and that is what many apps will target. How many people will actually bother to create "pro" iOS apps that make full use of that 4gb of ram?
Because of this, I am having a hard time envisioning a use case for an ipad pro. The hardware may be there, but the software ...?