I've read a couple reviews in the Brit magazines (BIKE and MC Sport/Leisure)
on the 390 Duke. I was surprised reviews were a bit mixed. Brake, suspension and fueling complaints, plus some build quality comments. But very early and very short reviews. They liked the power and handling, IIRC.
Far as I've heard both the KTM 200's and 390 Duke are for sale in the UK and EU. KTM claimed the USA would be getting both in the Fall '14. No local reviews as of yet.
About 1.5 years back Pierer did an interview in Cycle News (US). There he talked all about KTM and it's future. Great interview ... very detailed.
Anyway, he said then that the 390 Duke would be followed by at least two follow up models, for sure an Adventure version. So the 390 ADV has been on the cards for a while.
Lets hope they don't screw it up.
MSRP for the Duke in the UK is £4500 ($6750 USD) not cheap for a 400cc bike made in India, especially considering Yamaha's two latest models ... FZ-09 and FZ-07. $8K for the 09, $7K for the 07. I haven't heard how the KTM 200 sales are doing in India ... but KTM have high hopes in that market.
But US riders always pay less than UK .. so direct conversion does not work. I'd guess around $5000 USD for the 390 Duke, a bit more for an Adventure version, which is probably a year away from USA.
Recent report I read in MC Sport & Leisure shows KTM has done a major deal with a major Chinese manufacturer ... pics show assembly line, looks like the 200 but could be the 390's have shifted production to China and I've no idea what the implications are considering Bahaj own about half of KTM. Very strange goings on. EDIT
further research indicates only assembly is being done in China ... units all manufactured in India at Bajaj factory. Chinese units for China only. My guess KTM/Bajaj will do more with China in future.
If done right, KTM could blow the doors off the market with a 390 Adventure.
Just what the market needs. Fingers crossed!