Blizzard co-founder Mike Morhaime has published an open letter which was just sent around by Blizzard PR. The full text of the letter is available here, but for the people without an attention span, the summary version is that, as a result of the community outcry about the real-names-on-forums issue, they have changed their mind:

We've been constantly monitoring the feedback you've given us, as well as internally discussing your concerns about the use of real names on our forums. As a result of those discussions, we've decided at this time that real names will not be required for posting on official Blizzard forums.

(Emphasis mine.) Also of note:

I want to make sure it's clear that our plans for the forums are completely separate from our plans for the optional in-game Real ID system now live with World of Warcraft and launching soon with StarCraft II. We believe that the powerful communications functionality enabled by Real ID, such as cross-game and cross-realm chat, make Battle.net a great place for players to stay connected to real-life friends and family while playing Blizzard games. And of course, you'll still be able to keep your relationships at the anonymous, character level if you so choose when you communicate with other players in game. Over time, we will continue to evolve Real ID on Battle.net to add new and exciting functionality within our games for players who decide to use the feature.