According to producers, the new black speedster fighting wally is Savitar, here is some info on the character:Savitar first appeared in Flash (vol. 2) #108 (December 1995), and was created by Mark Waid and Oscar Jimenez.
A Cold War pilot for a third-world nation, the man who would become known as Savitar was to test a supersonic fighter jet. As he reached top speed, his plane was struck by what appeared to be lightning, and he went down in hostile territory. Discovering he could defeat the enemy by moving at super-speed, he became obsessed with speed, naming himself after Savitr the Hindu "god of motion", and dedicating his life to unlocking its secrets. As Savitar studied, he discovered new powers that no other living speedster has mastered. He can protect himself in a null-inertia force field, give speed and kinetic energy to objects or people, even those in a rest state, he could also heal his own injuries almost instantly.