How collaborative can Unity development be?

I’m researching different gaming engines for use in serious games/simulations. One of our requirements is a quick turn-around for world/simulation changes. To do this, we’ll need multiple engineers editing the same scenario simultaneously so that something can be shipped out/shown the next day. HeroEngine provides this feature. Multiple engineers can be editing the same world at the same time and each can see the others changes real-time. Does Unity provide this feature? Or is it more of a CM thing where you’ll need to update a repository and rebuild to see someone else’s changes?

I don’t know if Unity has this feature, you can ask one of the Community Managers or Admins about this.

I’ve heard something about Unity 4 providing ASCII file format for scenes and now you can merge scene being worked on different machines…
I just don’t know if UT have implemented that.
I personally work alone when working on Unity projects, so I may be very wrong about all that. Didn’t really pay attention to the topics.