Our friends at Universal Audio have sent an email out to users offering advice for those considering a new Mac Pro. They write:
Dear UAD/Apollo User:
As you may know, Apple recently began shipping their new flagship Mac Pro models. These new machines are based on all-new PCIe architecture which changes the way they work with UAD-2 and Apollo hardware.
Apollo/Apollo 16 interfaces, UAD-2 Satellites, and the UAD-2 OCTO will be fully qualified to work with the new Mac Pros over Thunderbolt via a UA firmware update in early 2014.
Unfortunately, UAD-2 SOLO, DUO, and QUAD PCIe cards cannot be made to work with the new Mac Pros. (See table below for full UAD/Mac compatibility list.)
Importantly, the UAD-2 OCTO PCIe card will require a qualified Thunderbolt-to-PCIe chassis for compatibility with the new Mac Pros. UAD-2 Satellite owners, and Apollo / Apollo 16 owners not using Thunderbolt, will be able to connect to new Mac Pros via an Apple Thunderbolt to FireWire Adapter.