The StarCraft II interview on Eurogamer.net features Blizzard's Dustin Browder discussing their eSports aspirations for their real-time strategy sequel. Along the way he is asked about their plans to build a user-marketplace into Battle.net, and explains how they are struggling with this. Here's word on their progress:

Struggling. We are moving forward. We are working on it actively now. As you can imagine there is an immense number of challenges for us to overcome. We're trying to deal with those issues. I don't know how we're going to solve some of the player rights issues. How do players protect their own maps so they don't get ripped off by other players? What are the rules of how much you're allowed to charge? There's just a ton of work for us to figure out.

We've never, ultimately, built anything like this before. Some of our competitors have and more power to them. But we haven't done it yet. So there's going to be a bunch of work for us to figure out how to get this done. But it's something we're working on. It's definitely a distance down the road. It's not in the next month. It's going to be some distance before we get this in the hands of the fans.