The regular iMacs, yes, I think we've seen the last of Intel. The iMac Pro; I have no idea. It's possible it gets one more go with Intel and Big Navi - Maybe even in a new iMac design language. But it could also just fizz out now that the Mac Pro exists, as some have deemed it the stop-gap solution. I really have no good guesses
I think Ming Chi Kuo's prediction of a 13" MacBook Pro and 24" iMac late this year is looking increasingly likely - the 2 port Pro and 21.5" iMacs didn't get chip updates earlier in the year, and now both of those models have slipped out to late October shipping, at least on Apple's UK website. A launch at the 13th October iPhone event is seeming more and more plausible...I think after Apple launches the first ARM Macs, they will release no more Intel Macs to have a clear transition. If that assumption is true, then the questions are, firstly, when Apple will release the first ARM Mac and, secondly, if they release any Intel Macs before.