Player controlled Empire against player controlled Republic, with the outcome being decided by the timely arrival of player controlled smugglers and bounty hunters. Sith and Jedi players doing their thing, advancing their storylines with the larger battle as backdrop, boarding vessels, meeting blades planetside. 

Actual winners and losers, even if it takes a week of refereeing OOC to get to as close to a mutual satisfaction with said results. New players having picked up characters and jumped into it all, some ignored IC because they broke whatever unspoken (or spoken) rule and will have to try again, some who get it right and have an action packed introduction to the RP. 

Groups of players with IC families in fantasy sci fi settings. Hard darkness, bright neons, and cold rains in cityworlds where a pair of slicer players dive into a cyberpunk noir story. 

Watching players actually realize what this is and really take ownership, in short. 

Some player out there will probably be the Dark Lord of the Sith at some point if it takes off, and for some reason I find that fact endlessly entertaining.