Update #3How big is the world?
The world currently consists of four big zones. There is a short loading screen in between zones, but you can play around in one zone for hours without ever seeing a loading screen, so one zone is actually pretty large. It’s possible that more zones are added as a result of the Kickstarter campaign.
Update #8Except in a few special circumstances, your party doesn't need to stay together. Sometimes the game will ask you to gather your party first, usually only when going from zone to zone, but our zones are very big (think Divine Divinity big).