I'm seeing rumours on various blogs of a new low-end iMac, replacing the current 21.5-inch models with a 23-inch display while retaining the same form factor. This is achieved by reducing the size of the bezels around the edges of the screen. It's expected they'd use 10th generation Intel processors as well.
Would be good if the displays were Retina & SSDs used instead of HDDs & Fusion drives.