If you want more telephoto range than the 4x of the Canon G1X, while still having a sensor about that big and a screen that can be tilted up, then fixed lens compacts are out, and the options have mostly been mentioned: Olympus OM-D E-M5, Sony NEX 5 and NEX 7. I believe that the screen of the Panasonic G3 and GH2 can be tilted up for the top-down viewing style, but it must be rotated out to the left, so that might not suit you.
Keeping compact probably means having a second telephoto lens, and in that domain, the Micro Four Thirds lens system offer far more options and better compactness than NEX, inclusing both do-it-all wide to telephoto zooms like a 14-140 and a 14-150, and various pure telephoto options like 40-150, 45-175, 45-200, 75-300, 100-300.
But none of those is that compact, so a plan for compactness probably involves two lenses, a compact standard wide to moderate telephoto and a pure telephoto zoom that stays at home some days. Or maybe one or two primes for days when compactness is the priority and a wide ranging zoom for other occasions.