Just read this that goes into a bit more detail than what I'd read yesterday:

http://www1.skysports.com/f1/news/12433/...f1-rule-changes

It will be a standing restart after the safety car... unless... the safety car is deployed within two laps of the start (or a restart), or within five laps from the end, in which case it will start as now. It doesn't make clear, but if I've got it right I think that the cars will trundle around behind the safety car until the incident is cleared, then they'll line up on the grid to restart - in other words stopping so they can start again.