I'd expect iMac Pro to come with options of M1 Pro/Max/Duo/Quad, there's no need to hold back the Quad. And the Mac Pro to be simply Duo/Quad options, but maybe w Pro/Max options. The Pro/Max and Duo/Quad will have one major architectural difference, in that the Duo/Quad will have the ability to extend RAM beyond the SoC to at least 1.5TB, but most likely more.I expect:
March/April: new 27 iMac with M1pro/max and hopefully an option for a M1max Duo, a M1pro Mac Mini, 24 inch and 27 inch displays and the iPhone SE
June: new Apple Silicon MacPro with M1max quad, new 32 inch Pro Display XDR and the announcement, but not release, of the AR/VR headset. I expect that to be released in December.
September: iPhone 14, Apple Watch series 8, iPad 10th gen and iPad Air5
October: M2 MacBook Air, M2 24 inch iMac, M2 low end Mac mini, M2 iPad Pro, AirPods Pro 2