There was a little confusion in the newsletter that announced the ReticleOS update in the works. For the R-7, we will be updating to Marshmallow (Android 6.0.1). That will be the last version of Android we can support on the R-7, which uses the Qualcomm Snapdragon 805.
The preview of that OS will start soon for some VARs and partners, but won't be generally available until sometime in Q1 2017. The main reason is because we are getting versions of various partner software and SDKs updated for it.
Please note that the preview will have some issues and bugs, but depending on what you want to use it for, it could work for your initial integration. We are hoping that by mid to late Feb. we will offer folks a stable beta OS to try.
The mention of Android 7.0 support for the R-7 was a mistake (sorry!), but for new devices ODG announced at CES - the R-9 & R-9, they will run Nougat (Android 7.1.1) from the onset. There will be more information on those devices coming soon.