It's a good edit, the "wings" look a little out of place, but meh, they're completely from scratch, right?
As it is, Batman Beyond = a lot cooler than the costume they have already, but the thing of it is, you have to remember that the man behind the mask in the series was the much younger Terry McGinnis, which is why the series worked so well, because Batman was now slimmed down and more acrobatic. The Batman in the game is going to be 30-40 year old Bruce Wayne, who just simply can't do justice to the costume. It would be cool, but what you have to remember is that this a fighting game, and most of the time the characters will be standing around in their stances throwing a few punches, not doing some of the awesome moves that Terry pulled off in BB.
While it would be cool to see the costume get some video game time, I'd rather it be in an adventure game, than this one