We jump all the way to March 21st, 2012 for this fourth Diablo III developer diary video, during which game director Jay Wilson, art director Christian Lichtner, and lead software engineer Jason Regier reflect on the game's development now that it's "done". In particular, they discuss the difficult decision to push the game back into 2012, the massive changes they made to the skill system, the problems that led to the rune system overhaul, and the importance of community feedback: