Well, as I said, I'm skeptical, that said, there is some truth in it. The delivery date to chinese crowdfunding backers (JD.com), is Sept 15th. ie they will get theirs before Indiegogo backers. . This means GPD would have produced them by the end of August. The thing here is that the retailers that are saying they will get a first batch of stock are in china also, so it's feasible they will be sent stock at the end of August. Mind you, as a westerner, you wouldn't get it until probably Oct anyway. Free shipping is slow as.
I'm not sure what changes they will make from testers reviews. It may be more for marketing purposes. Remember they only went to people with social reach (youtube channels etc) and it's expected we will do online reviews of the units. I suspect unless the thing blows up or minor and quick to fix changes are identified, then their wont be much changes. It's probably no secret that I was promised a test unit. So I'll let you know what it's like if I get one