The website hasn't changed since I first read the topic, and so I'm presuming it hasn't changed since the original post.
As mentioned by the poster, on the website there are no photos, there's no video, there's no information about the cast aside from Better Midler. This appears to be intentional, since the ad campaign is "Bette Midler. Hello Dolly! On Broadway. What more do you need to know?"
It really seems like they're selling it (successfully) to people who already know and adore the show, and who already know and adore Bette Midler. Based on the one(!) photo released so far, it looks like it's going to be a nostalgia fest. That could be a lot of fun, we'll see. (Well, I won't see, unless Donna Murphy nights start popping up on TDF.)