The VW website is confusing on this. It looks the following airbags are standard for the Rabbit: frontal airbags, side impact (torso) airbags for front passengers, side curtain airbags for front passengers. Rear side impact (torso) airbags appear to be an option on the four-door. What I cannot tell is whether the side curtain airbags protecting front passengers also protect rear passengers. (Often it is a single curtain protecting multiple rows.) Another possibility is that the rear side impact airbags are head and torso airbags, not just torso airbags. You are going to have to ask the dealer about this, and make sure you get an informed answer. I spent a lot of time car shopping this summer, and sadly, found that I often knew more about a car's safety system than the salesperson did.
I think side-curtain airbag in rear seats are a no-brainer if you can get them. They appear to pose no risk, and while it's unclear how much they help young children in seats, they certain benefit adults or older children. Rear side torso airbags are more controversial, because of the concerns about deployment right next to a child. But the out-of-position occupant testing I mentioned in the last post was aimed at addressing those issues. I wouldn't have any qualms about installing seats next to rear side torso airbags that do meet the standards.