Today June 29, 2016 is the last day when you can apply the Windows 10 Upgrade from the eligible platforms, and the next August 2 is expected the Window 10 Anniversary Update, and the begin of Windows as a Service.
The idea is that Windows will be away from being a monolithic product with periodic major releases to a product that is continually updated and tweaked, in a similar a model how iOS, OS X are updated.
