Engagement and Social Profiling
Would be good to see some gamification statistic analysis in the site reporting tools. And possibly an SDK for app developers to play with.
Achievers, Explorers, Killers, Socializers
Being able to determine a profile for each of my users, and tailoring the UI to suite their needs would be amazing.
Being able to get statistics on breakdowns on social types, and drill down on any give user to view their profile in a gamification context.