I wouldn’t hold my breath waiting for an exact replacement, but an M-series iMac might still be a good replacement. Apple announced a two year transition time

I wouldn’t hold my breath waiting for an exact replacement, but an M-series iMac might still be a good replacement. Apple announced a two year transition time from x86_64 to Apple Silicon. The MacBook Air, Mac Mini and 13” MacBook Pro have made the jump. That leaves the Mac Pro, 16” MacBook Pro, the 21.5” iMac and 27” iMac left to make the jump or otherwise be discontinued.