Availability for Apple's new Mac Pros is limited, at least relative to all the pent-up demand. If you did snag one, or to be more realistic when you finally get the one you ordered today, Apple has a firmware update for you called Mac Pro EFI Firmware Update 2.0.
First, let's put up a picture of the guts of the new Mac Pro just because we can:
Apple's New Mac Pro
Now the patch notes:
This update is recommended for all Mac Pro (Late 2013) models.
This update improves system reliability during reboot, resolves an issue with memory self-test, and improves graphics power management when using Boot Camp.
It's a 5MB download from Apple's support site, but it should appear in the Mac App Store, too.