Warner Bros has released the blu-ray box art as well as special features that will be featured on the discs for both Arrow season 3 and The Flash season 1. Below is the full list of special features for each set. One interesting thing to note on the box art is the absence of the DVD discs, which came with the first 2 seasons of Arrow blu-ray sets. Both sets will be released September 22, 2015 and are currently available for pre-order.
BLU-RAY & DVD FEATURES
The Fastest Man Alive!
Creating the Blur
The Chemistry of Emily and Grant Screen Test
Behind the Story: The Trickster Returns!
DC Comics Night at Comic-Con 2014 Presenting Gotham, The Flash, Constantine and Arrow
Second Skins: Creating The Uniforms of Arrow
Nanda Parbat: Constructing The Villain’s Lair
Two Arrow Audio Commentaries
Arrow at Comic-Con 2014
The Man Beneath the Suit – Atom’s First Flight
Street Date: September 22, 2015
Warner Bros has also released the box art for Gotham season 1, but no word yet on that set's special features. Gotham season 1 is slated for release September 8, 2015.