The AER 48 air fork from WP has been around for a while now. It was stock on many of the Euro KTM/Huskys for 2016. In addition, the forks are available here in the USA from any authorized WP dealer. It only has an air spring in one fork leg. The other leg controls compression damping and rebound. Most of the reports are that it is the best stock WP fork that the KTM factory has even spec'd on their stock bikes. Which, considering how bad the current 4CS fork is, is good news. By the way, the air fork is a full three pounds lighter than the current fork.
Now, on the 2017 xcw/exc models that KTM will announce officially in a few days, that fork is going to be a new version of the open chamber fork that is currently on the same line of bikes. The big difference is one leg will have rebound, and one leg will have compression damping. This addresses one of the big issues with the current design which really has not been overhauled in basic theory for 15 years or more.
The new 2017 Huskys are cool, but we still see a white and blue KTM basically. I thought the product lines were going to diverge more than this. Anyway, with these new two strokes, KTM/Husky are going to raise the bar. They basically got the four stroke chassis of this year's MX models, and KTM applied the whole "mass centralization" approach to the two strokes now too. The bar has been raised.