You can regulate your vape a few different ways, VW just does the math for you. Stacking batteries doesn't bother me, it just creates one more thing to keep in mind. I like my provari the way it is, I don't bust out over the 13 watts it allows so I don't really need a new version or a provari killer. I have nice mechs as well.
So for me, personally, even if they pull off the DNA20/mech package, I am not sure what role it fills for me. Unless it is just a sexy device, it's not going to be worth $250 for me functionally.
This is my big worry. Im just starting to upgrade away from eGo's and Im afraid by the time it comes out I will already have gear that fills that niche. All depends on quality though. Lets hope its not a "jack of all trades, master of none"