Very cool!!! It must be in Beta where only a select view advertisers currently have access because right now I don't see Native Ads as a campaign option in my Google Adwords account.
It's been around for well over a year, but not really controllable in the back end. You'll hit these placements if you're running text ads on GDN
It's actually responsive ads, they can act as a banner, text or native ads
have yet to see - def want to try it out
I also did not see, will need to check in the settings of Google Adwords