The release date for Debian’s next version called “Stretch” was announced on the mailing list yesterday. Release date will be Saturday, June 17th, 2017 which is less than three weeks from now.
So if you have your repositories pointed to “stable”, you’ll get the upgrade automagically – if it’s “Jessie”, you’ll have to change that if you want the newer stable version. And Jessie will be oldstable from then on, as usual.
Cool. Looking forward to getting it.