Well officially we haven't released the 0.3.0 revision. Just some team development versions that will eventually lead to 0.3.0. Confusing isn't it?
The real difference between them is that the starting ship, Falcon, has new textures, Manhattan has new textures, Ghost (buyable ship) has new textures and so on. Though to get the 0.3.0-pre2 working you need to get the fix patch.
http://koti.mbnet.fi/sfhaven/downloa...030pre2fix.rar
The 0.3.0 pre version was compiled in a hurry so it has few bugs. Also 0.3.0 should have the first four missions coded though if I remember correctly GandalfTheWhite said that the 4th mission isn't working.
And I believe that the mission data is in Main_Events.txt or in Main_Missions.txt
It might be that the mod doesn't change the second mission start available after completing the first one or something like that.
I hope that helps.