They make Dukes in 390, 690 and a Super Duke 1290 and I think a few smaller versions in some countries. All look like great fun, but they aren't cheap. It's $9000 USD for the 690 single. Cool bike that I would love to own but not at that price.
The KTM demo truck came to town a couple months ago and I rode the 690 and 1290. The 690 was an absolute gas! I think the 390 would be an awesome "around town" bike......especially for a life-long dirt rider. I've yet to see one.
Saw a few things on the 390R recently. I would love to have one. I live a short distance from a nice road race facility and quite frankly, that's the only place my wife would let me ride a bike like that (or own one for that matter). I have no idea if the 390 will ever be available anywhere close but likely a bit pricey anyway. The CB300 ought to be quite fun if they keep it affordable I'll start saving my allowance now.