The Defenders is scheduled to be released in mid-2017 on the streaming service Netflix, worldwide, in Ultra HD 4K and high dynamic range. The 8 hour-long episodes will be released simultaneously, as opposed to a serialized format, to encourage binge-watching, a format which has been successful for other Netflix series. In January 2015, Netflix COO Ted Sarandos said Netflix planned to release a Marvel series approximately a year apart from each other after Daredevil's April 2015 release.
Above: Iron Fist, Daredevil, Jessica Jones and Iron Fist
Below: Daredevil
Valkyries 1st app. in The Defenders #4. Thank You Dave!