I would say almost certainly no. Apple has clearly become a consumer/retail oriented company; few organizations ever really bought into the idea of the Xserve line, and to the extent Apple are still interested in "enterprise" sales it's for MacBooks and iOS devices.

I have a feeling that if Apple wants to get back into servers they'll do it with an ARM-based product sometime in the next two or three years. There's not much room for them in x86, and they've clearly abandoned existing customers. But with ARM they can start fresh and leverage a lot of what they've put behind iOS devices.