I don't know that there will be many, and the ones there are will not be glowing reviews. This launch was a last second bait and switch, which is why no reviewers got early access to the device...
Yeah it's disappointing that reviewers didn't get early access, but it's pretty obvious why. I did see on Reddit yesterday that a German reviewer said that he was supposedly receiving a review loan unit today. Any decent review will take some time though with the testing that is required. So maybe it will be a week or two before we see much.