Currently the developer preview of Android N is only available for Nexus devices by Google and it's partners.
Now there's an out-commented hint on the preview page.
There it says:
New in the Android N Developer Preview:
- Accompanying Android Beta Program for consumers, starting later in the preview
- More supported devices, including devices from OEM partners
- Seamless OTAs for your devices, from initial release to final N release without flashing
At the moment that's very surprisingly, because there was never something like this before. Maybe Google recognized, that Android fragmentation is a huge problem, primarily a huge security problem, and for many people an argument against Android.
But nevertheless I don't believe this preview will be available for any Samsung, LG or Huawei device? (You know what I meanâ€¦ bloatwareâ€¦).
Feature Image from Droid Life