I am really concerned that single player needs to do some kind of online sync.
Single player I am really hoping is compeltely and utterly offline. I want to have multiple saves with different careers testing things out. Every save would be a new stand alone universe.
I should be able to take the DVD out of the box, load it up and play it in the middle of nowhere without ever having any kind of internet connection.
So
1. Single player completely and utterly offline
2. Multiplayer (which will then sync of course to stop you trying to cheat
and a single player game can never go multiplayer.
This is a really important thing for me, as Alien said, the single player should be it's own universe.
If single player needs sync / internet connection then it is a deal breaker at least for me.
I've thought about similar stuff as well, I would be surprised if players alone could generate nearly enough variables to actually drive a galaxy so I'm willing to bet that there will be all sorts of driving mechanics making each of our universes work and they're going to have to be independent to a certain extent otherwise we'd be waiting all day for other players to catch up or for us to catch up. It does make you wonder though, how much effect a single player will be allowed to have over others universes. It's a pretty fine balancing act I bet and I don't think (with my limited understanding) that it can be one or the other, rather a combination.
I dunno how I feel about not being able to start from 'year dot' every time... I guess it's not too much of a biggie, you can still gauge your success based on time since time is still going to be linear and the universe will be so diverse that each story will be unique regardless.