I think I saw somewhere that Asus had their own liquid cooled overclocked which presumably has a higher boost clock. If you cant get a regular AIO version without a bundle I'll certainly be getting the Asus.
http://promos.asus.com/US/PR_2017/ROG_AMD_RX_Vega/index.html
At the bottom of the page, but I cant find the other site that had clockspeeds on them.
Those are the "Asus Reference Card" Designs. Those clocks are the 1:1 exact same clocks AMD has posted for vega so far. The aftermarket cards shown in that page with the big cooler are listed above those where it says "TBD". We don't know what clocks the asus aftermarket cards are, they won't tell us yet.