Gosh. What a look. He couldn't look any more 'villain' if he tried...
These costumes do look silly in harsh broad daylight like this, but use a little imagination and you can see this suit, and character, will be rather impressive once he reaches the screens.
Being sensible I can't see them repeating the same theme of an evil speedster terrorising all and sundry the entire season. Not three times in a row. So given The Flash returns October I am guessing this scene being shot is from later on in the season, I would almost be tempted to say "Johnny Quick!", but he could be anyone.
well, about the only type of villain to be a major challenge to the Flash is another speedster, either due to the speedster being faster, at least until Barry powers up, or because the speedster is a ruthless nutcase who will use their powers in ways that Barry will not, or just the fact that they will kill.
Other metas give Barry a good fight but in the end they get beaten while evil speedsters on the other hand take a lot more to bring down.