Our sources say that it’s highly likely that the Studio and Mini will skip the M3 and go directly to the M4.
PS: Very thin support for it so far, but allegedly the graphics in the M4/Pro/Max will take a substantial bump (250%) in contrast with the overall chip which will only gain minor performance bumps. OTOH the M4 might also be significantly more power efficient compared to the M3 eg… it might deliver similar performance with a TDP reduction of 25% plus.
And… it also might open up the option of 3rr party PCIE graphics.
Again all of this is nothing but rumors at the moment.