Samsung is known for slowest OEMs to release major firmware updates as it has numerous handsets and each of which has so many software modifications. Samsung will soon launch a beta program with Samsung Galaxy S7 Edge (We assume with S7 as well) at least for US and UK users. For beta testing, selected users will be able to install the Android Nougat update with the help of beta program. Willing customers can check out the latest software and report inconveniences like bugs and glitches.
Though the beta program is yet to be officially announced, mariolcela, an XDA developer started a thread called Galaxy Beta Program. You can download the app from Galaxy App store of Galaxy S7 Edge (hopefully Galaxy S7 also). XDA Thread interpreted the APK posted on the thread is for signing up for the Samsung Beta Program in the UK.