Blizzard sent out the following
Get ready for a gravitational pull like no other – Sigma has arrived!
The 31st Overwatch hero, Sigma is a kind and brilliant scientist who has been irreparably changed by an experiment gone wrong, gaining the ability to manipulate gravity in the process. During that tragic experiment Sigma sustained serious psychological damage, deemed a threat to humanity and locked away for years in a secret government facility. He was eventually freed by Talon and used as a living weapon. Sigma is now live on PC on the Public Test Region (PTR).
Sigma will shield you from harm, but apply enough force and he shall apply it back!Bio
Real Name: Siebren de Kuiper
Age: 62
Occupation: Astrophysicist/Professor
Nationality: Netherlands
Affiliation: TalonRole: Tank
Abilities
Hyper Spheres
Sigma launches two gravitic charges, which implode after a short duration, dealing significant damage in an area.
Experimental Barrier
Sigma propels a floating barrier to a location of his choosing. He can recall the barrier at any time.
Kinetic Grasp
Sigma stops incoming projectiles in midair, converting them into shields.
Accretion
Sigma gathers a mass of debris and flings it at an enemy to knock them down.
Gravitic Flux (Ultimate)
Sigma manipulates gravity to lift nearby enemies into the air and slam them back down.
For more info on Sigma please visit his hero page: https://playoverwatch.com/en-us/heroes/sigma