I'm guessing G1X sensor so they can keep the lenses nice & small like μ4/3. With a 1.85x crop the pictured 22 becomes a 40mm pancake...
I'd also assume that they didn't include a built-in finder so that they could keep it as small & inexpensive as possible, and so that they can sell expensive accessory finders to fools like us that will buy them <grin>.
If they release a luminous standard zoom like a 24-105 (equiv) f/2.8 IS or something then I'm all over this thing. For me, good small lenses for the system are the deal maker/breaker. The glass has to be at least in the same ballpark as my Fuji X10 (28-112 f/2.0-2.8 ). If a boring f/3.5-f/5.6 kit zoom is the only option besides this little prime then I'm certainly not going to be among the early adopters, especially in light of Panasonic's impressive new compacts. Manual focus assist is also going to have a lot to do with my decision.
Now that I think about it, this puts Canon in a very interesting position. Previously, they never had to release roadmaps as their lens stable was complete & just about updating things from time to time. Now, if they want people to buy into this system they had better give a preview of what's coming down the pipe in the next year or two, just like all the other newcomers to the mirrorless market.