There are supposed to be released on Monday, but funnily, except the Korean leaks there is very little talk about them - i mean, before the 7900x came out, DerBauer has been delidding it like there is no tommorow 2 weeks in advance, talking about its supposed OC capability etc... there was quite a lot of hype days before Threadripper release day too. Now, 7920x flew completely under the radar and so far it looks there is not much interest in the other 3 chips as well.
However, 7980xe, being the monster, will surely get into limelight.
BTW, do you have these CPU listed in your prefered stores? 2 days before release and over here in Europe, nothing. No info on availability, or possibility to preorder, simply no mention of them. They were at some point, about 3 weeks ago, even with prices (1350 EUROs for 7940x, about 1700 for 7960x...), but they were removed from the store and did not come back since then.