Rogue One: A Star Wars Story - Celebration Reel
https://www.youtube.com/watch?v=HUb_zpdyDpU - from the official Star Wars YouTube channel (3 mins long)

Originally shown at Star Wars Celebration July 2016.

Rogue One: A Star Wars Story “Creature Featurette”
https://www.youtube.com/watch?v=P2N0Mn4i4Dw - from the official Star Wars YouTube channel (1:20 mins long)

“Director Gareth Edwards and Creature Effects Supervisor Neal Scanlan offer a behind-the-scenes peek at the creatures of Rogue One: A Star Wars Story.”

ROGUE ONE Blu-ray BONUS CLIPS

https://www.youtube.com/watch?v=CT24bd2XPxQ&list=PLYn2a0e2FVIKni_wHXR5CJYBnnnYH7mIB&index=15&t - from the Flicks And The City Clips YouTube channel (13 mins long)

Index:
Vader (0:00)
Death Troopers (1:14)
Mads Mikelsen (2:11)
Saw’s Origins (3:36)
Casting Diego (4:35)
K-2SO: The Droid (6:04)
Cardboard K-2SO Head (7:15)
Walking on Stilts (8:18)
Riz’s Auditions (9:23)
Training (10:41)
Connections (11:52)