[Brightcolours]

Size is not an issue for the Z50 nor for the A6xxx nor for a Leica CL ... ;-) ... yet they have an upgrade path. Unlike EOS M.

Only Nikon Z and Canon RF offer a big diameter mount, which has its advantages (certain optical designs are all of a sudden possible) and its downsides (size).

The Nikon Z50 is bigger than the competition from Canon, Sony, Fuji (and talk about lack of lenses APS-C lenses..)
That, and the Canon DPAF for video, make EF-M more viable than the whole Nikon Z range. at this pivotal moment. Only Leica CL sells less than Nikon Z APS-C ;-)

The last rumours concerning EF-M lenses date from March, just before the worldwide corona issue. It mentioned a 15mm f2, a 52mm f2, a 64mm f4 Macro, a 100-300mm f4.5-8 and a 18-45mm f2.8-4.
At least the latter lens now has surfaced in more recent rumours as being a FF FF lens instead, which gives the march rumour more credence.