If you've been wondering on whether or not to pull the trigger on a RX10, you may want to hold onto your credit card a little while longer. Canon has previewed a prototype of their upcoming G3 X and it looks like it'll best most of the RX10's key features. 

Canon hasn't specified how many megapixels the sensor will be, but they have announced that it will be a larger 1.0" sensor and in front of that sensor will be a massive 25x optical 24-600mm megazoom that will give you incredible versatility with a wide array of focal lengths. 

More info at canon.com.