It's going to take a while for reviewers to form a reasonable opinion of the game. I can't imagine trying to review a 100-hour game in less than a week.
Based on what I've seen on YouTube, even the people that got advanced copies won't be streaming until launch date, so I'd guess there's an embargo for streaming until then at least.
When it comes to embargo restrictions, though, there might be different layers of content that reviewers can talk about as we get closer to release date. I'm hoping for some more crumbs before next Thursday!
Yeah, I'm not worried about getting full reviews anytime soon, but a bit of additional info before launch would be great. I'd like to see how the new subclass features are implemented (even just the early lvl features) or how some of the new spells and feats work.
