I don't think this 16" model will have a radical design outside. If you look at a Magic Keyboard from the top (not at an angle) it looks similar to the current laptop keyboards, so that photo makes some sense. They could still borrow the look but have a completely different scissor mechanism underneath. It looks like the Touchbar will separate out the Power Button/Touch ID on one side, and the ESC key on the other. They will probably use the same chassis as the current 15" (same size, weight, and ports), but just have slimmer bezels to squeeze in the larger display.
If this is going to be more expensive than the current 15" (as rumored), then it will have to have improved performance due to newer/faster processor/memory/storage in it.
This would tie in perfectly with the release of the Mac Pro (which was already shown off at WWDC), and if geared more towards a "Pro" user, then it could be announced anytime with just a press release before the Fall season ends (when the Mac Pro was promised.)