iMac Pro Appears to Include A10 Fusion Chip for Always-On 'Hey Siri'

According to some digging into Apple's "BridgeOS 2.0" code and macOS this weekend by Jonathan Levin, Steven Troughton-Smith, and Guilherme Rambo, the upcoming iMac Pro appears to feature an A10 Fusion chip with 512 MB of RAM. While the full functionality of the A10 chip isn't yet known, it appears the chip will enable support for "Hey Siri" functionality, potentially even when the iMac Pro is turned off.
As noted by Troughton-Smith, the A10 will manage the booting process and security for the iM