Meh, there are 18 new ones so far but I suspect there will be more coming. They will just do what they did in FH2 and release it as an expansion pack. I can't give away too much at the moment but basically some people have managed to crack the code and we have the first part modification exported into the build. You will hear about it soon, its good and bad news too be honest. Everyone wants new content but not like this...
It might persuade the developers to no-longer continue on FH3 if this gets out.