strat666, it will be very interesting to know if the weaker areas of the G3 have been improved.
Could you do some autofocus testing? here's a typical miss by the G3:
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Is part of a three shots series; two came out focused, and this (the middle one) the G3 decided to focus in the background, as if the subject weren't filling enough frame area... go figure. BTW, the CA in the shot isn't G3 fault but the teleconverter I used.
Test by placing the subject with a high contrast background besides it.
Another very interesting feature wil be if they have implemented the external flash focus assist beam or not. You could go to a shop and try the 420EX or 550EX, and see if the focus beam is fired or not... that will be a very welcomed feature.
In fact, we G3/420EX owners should press Canon to implement it, given the poor autofocus/beam blocking the camera has. I'm pretty sure it wont take more than a couple days for an engineer to enable that

Another question: in Manual mode, is there E-TTL flash metering available (i.e. is it possible to set the flash EV compensation in the function menu?) or only fixed output steps?
Have you noticed more options or flexibility in the Av Tv or M modes?