I don't get this. Why would we need to get over with it and not have an EF-M version which is 25% smaller and lighter, after some 10 years and several generations of EF-M bodies???
The EF-M 55-200 is great for weight at only 260g, while the 70-200 IS is 760g, quite heavy for M bodies, close to 1kg with the adapter. What i would like is a bit better lens optically and in build quality for maybe 100-150g more.
So a 55-200 with better IQ, maybe F 5.6, metal mount and weathersealing would be great.