Unite '11, the fifth annual developer conference for publishers using the Unity development platform for games and 3D, has announced that its keynote speaker will be Diablo and Diablo II co-creator and lead programmer David Brevik, president and COO of Gazillion Entertainment. Brevik will address the changes in the game industry, the growth of "social" games, free-to-play business models, download distribution and other topics. The conference features four days of activities.