At the Microsoft Cloud Presentation
Microsoft unveiled a new Crackdown project this year at E3, but apparently we've already seen the game in action. Back in April, Microsoft held a small conference at San Francisco and showed off its cloud processing technology with tons of explosions -- it's been confirmed by Phil Spencer this week that it was in fact an early Crackdown build.
Go ahead and give it a look to get a taste of what to expect next year. As a big fan of the current-gen open world experience in inFamous: Second Son, I have high hopes for the enhanced sandbox of Crackdown 2015.
Phil Spencer [Twitter]