Daily Sims was amongst the few French websites who were lucky enough to meet Azure Bowie, one of the developers behind The Sims 3 World Adventures in which they were able to demo and play the game.  They have brought back their impressions of the game so far.  Keep in mind that this was translated from French, so it may sound a little odd:

For travel, you must call the travel agency’s adventures will be visible tab opportunities. A journal of adventures will remember the many graves visited the relics found, the number of times you’ve left your sim burn in a trap, etc.. Your friends ‘foreigners’ will be identified by a little icon of their country of origin. If you go further than friendship, and your sims have children with them, children will have the ways typical of their parent.

visit their translated review (thanks to SimOperations and Sims 3 Nieuws)