iMac Pro
IMac Pro is still expected to be on sale by the end of the year, although Apple's smart home speaker HomePod bounced, and the latest exposure shows that iMac Pro seems to be using it ARM architecture processor that supports 'Hey, Siri' voice wake up.
Developers Johnathan Levin and Steve Troughton-Smith found in the BridgeOS 2.0 package that iMac Pro seems to be going to be powered by a co-processor, the A10 Fusion. It will be the Mac's first A-series chip designed by Apple.