It's been two years since Apple launched its radically redesigned Mac Pro, but the professional-level workstation has not seen any updates since that time despite the availability of upgraded versions of many of the components used in the machine. We may be getting closer to an update, however, as
Pike's Universum has discovered a reference to a new Mac code name of "AAPLJ951" within OS X El Capitan.
The identity of the Mac corresponding to that code name is not explicitly revealed in OS X, but Pike points to the similar
AAPLJ90 code name for the current Mac Pro as a reason to believe this new machine is a Mac Pro.
Looking toward possible specs for the next Mac Pro, it seems likely it will run on Xeon-branded Broadwell EP chips and include significantly faster graphics based on AMD's Fury platform, along with faster memory and storage and perhaps Thunderbolt 3 connectivity involving a partial shift to USB-C connectivity.
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Possible Upcoming Mac Pro Reference Discovered in OS X El Capitan