The most striking feature is the new design. Apple has chosen to move away from the classic tower and is opting for a kind of cylinder. It is also significantly smaller; while the current Mac Pro is a large tower, the new version has been reduced to a good 25 cm. The volume of the housing is now only 1/8 of what it currently is. The chosen shape is not coincidental; Apple calls it a 'thermal core' and it is intended to ensure efficient airflow for cooling the internals.
7.5 Teraflops
The specifications are what you would expect from a workstation, geared for serious work. The RAM is of the ECC type, to prevent memory errors. Two Xeon E5 processors handle the calculations, supported by two FirePro graphics cards. Together, the components can provide 7.5 teraflops of computing power.
Thunderbolt 2, six times
The Mac Pro will feature the Thunderbolt 2 connection. This allows for a theoretical throughput of 20 Gbit/s per connection. Apple has placed six of these ports on the workstation. Regarding storage, the manufacturer uses an SSD, connected via a PCIe connection.
On the Apple website, there is a nice presentation of the new device. When and at what price the new Mac Pro will be available is still unclear.