The next generation of Android OS is confirmed to be named as Nougat and not Nutella. As the 5th beta firmware has been released to public, it will be the last Android 7.0 beta which can be downloaded on Nexus devices through OTA upgrade and the first official stable firmware will be available as early on end of the summer this year.
However, do not put high hopes and expectation of new feature in this beta firmware as it only comes with minor improvement and stability upgrades. More details can be found on Android Developer website.
Source : the verge