When will Canon provide a camera that people like me would want as a secondary/travel camera? Something that has at least APS-C, a fast lens with manual focus option, easy access to shutter speed, aperture and ISO, and a good optical viewfinder? I mean, how hard could that be to have some version of a poor man's Leica?
Fuji seems to dominate the chatter and good reviews for enthusiast APS-C fixed lens rigs -- the poor-man's Leicas, if you will.
But if you want to drill down, for enthusiasts with a fixed lens (and leaving out the consumer point and shoots and superzooms)...
Optical VF + fast fixed lens + full manual controls (if you want it) + APS-C = Fuji X10 (discontinued), X100 and X100s
EVF / LCD-only control + fast fixed lens + full manual controls (-ish) + APS-C = Ricoh GR, Nikon Coolpix A, Sigma DP3 and Quattro, Leica's X Vario and X2
EVF / LCD only control + fast fixed lens + full manual controls (sort of?) + 1" sensor = Sony RX100 I and II
...and then you get into the smaller sensor Pentax and lower-price Fuji rigs.
If you want a modular lens system, the above does not apply. Just go to B&H and drill down from the top under camera bodies and select what you want. Sensors dictate your call there.
APS-C and fast fixed lens = pricey, easily more than an SLR with a nifty fifty, and about the same as an SLR with a Canon 24mm F/2.8 IS (if you want something wider and sort-of quick). If you want a second body and money is an issue, ask yourself how badly you need to lose that mirror or have a big sensor / employ a tiny DOF. If you have
to have a skinny DOF, or need strong low light performance, etc., it's certainly more cost-effective to just get a second SLR body and use the lenses you already have.
This starts a question on the value of small rigs and what you truly are paying for, but that's a very very long thread to start.