Comparatively few people actually have the 645Z yet, and I imagine of those who do the ones interested & able to do a good review probably can be counted on the fingers of one or two hands right now. Doing a review of a camera like this involves a lot more effort than reviewing the latest incremental update of some P&S model. People who want the 645Z reviewed likely want a lot of meat on the bones, and putting out something half-baked will only earn a lot of criticisms of any inaccuracies, or complaints of "why didn't you cover this or that". Very few photographers can pay their bills writing lengthy reviews, so my advice is to be patient and let the info work its way out.
I'm impressed Ming Thein has put out so much info already, truth be told.
I'm nobody in particular but I'll have something to say about the camera myself, mainly from the viewpoint of landscape & travel type work. But since I don't even have a date when I'm getting mine and it will be one of the first ones sold over the counter in Western Canada, it's going to take some time. I just got back from 3 weeks in Iceland and tried very hard to get a 645Z to take with me on that trip. That would have made one heck of a field test! But there was no way.
I learned today that what may be the first production 645Z to hit Canada has been in the hands of some reviewers just for a few days, and they're working on something. After that I believe the camera is coming to my local dealer as their demo unit. Which is why I haven't been able to set my hands on it yet, let alone have delivery of my very own Z...