Canon didn't provide much useful information about the prototype of a G3 X that it plans to display at CP+ 2015: 1-inch sensor and 24-600mm zoom 25x lens.
In the absence of price, lens aperture specs or ship date there isn't a lot one can say about this. Given the Canon's traditional nomenclature, it should fit between theand the in the product line, but that would put the price between $700 and $800 and I highly doubt it will be that inexpensive unless Canon put a really slow lens on it, or unless it waited to ship it at the same time as a higher priced G1 X M2 replacement. The latter came out in June 2014, so I'd expect to see a new model around summertime this year.
I can tell you what I think it needs in order to be a great camera: better performance than Canon has been putting in its latest G series models. If it does, and Canon manages to build the camera with G7 X-level image quality, then I'm really looking forward to this one.