About the size and weight of a Sony NEX 5n.
Here's the specs:
Canon - 108.6mm x 66.5mm x 32.3mm, 298 grams with battery and memory card
Sony - 110.8mm x 58.8mm x 38.2mm, 269 grams with battery and memory card
The NEX 5n sells for $599.99 without lens and $699.99 with 18-55mm lens. We will find out Canon's prices tomorrow.
Either the EF 85mm f/1.8 (425 grams) or EF 100 f/2.0 (460 grams) would be a good combination with the EF M. Add the EM 22mm f/2.0 and I'd have all the lenses I'd need. YMMV
This (NEX 5n) is the camera that this EOS M is being targeted at, not the NEX 7.