Ideally, an M5 II would come out with, at the very least a deeper buffer out of your list (maybe IBIS is a problem they haven't solved yet), and a flippy screen and of course a viewfinder (either popup or fixed), plus some other goodies to make sure it's "higher" than the M6 II.
[Of course maybe IBIS is a problem they haven't quite solved yet AND they want to put it in the M5 II and that is why they haven't announced it yet?]
If I knew that it was never going to happen, I'd jump on the M6 II. So what's going to happen is, I'll wait. Probably until Black Friday. If there's still absolutely not hint of an M5 II by then, it's 90% I'll go for the M6 II, and be pretty happy with it.
Yea personally I don't mind the detachable EVF in this case for my intended use for the camera as much as I'd love a built in EVF and proper/flip articulated screen. Deeper buffer and IBIS are just nitpicking haha; can easily do without both I just think it's a bit of a shame when the camera is able to shoot at 14fps yet the buffer is so small and IBIS is obviously just nice to have.
I thought about maybe waiting for the M5II too but as rumour has it (well according to DPR's conversation to Canon rep) the M6II replaces both M5 and M6 but of course that's open to interpretation.
I am just really excited at the capability and image quality of such a small camera, all I need is the 11-22 and 32 1.4 and I am set! Everything else will be on my 5D4 anyway.