From Brian on his site:
I wanted to let everyone know that the reality TV series isn’t going to happen. I spoke with Andy Roddick and the Bryan twins and we decided it would not be in our best interest to move forward. One of the top networks would be airing the program but we felt like it would be too big of a distraction for our tennis careers – maybe we’ll look back into it when we’re all old and done playing!
I for one am really happy about it. Too bad, since it would've been on a big network, but good for the players, I'm glad to see they have their priorities worked out