From the campaign:
Portals and Prophets is a historical time travel game where players are traveling in a time machine attempting to be at the right place at the right time in history to experience historical events.
Setup time is less than 2 minutes and the game plays in about 45 minutes. The rules are simple enough that new gamers and children will catch on quickly, but provides strategic depth that will satisfy more hardcore gamers.
The Kickstarter is about 1/3 of the way to its goal with still 27 days on the clock (and no, time travel isn't a reality yet, so you can't go back in time if you miss out).