Ive been wondering this is well. For what its worth it was slightly different in the beta as "the dark within" was the only mission on earth that had the star with branches. The other missions just had the star. And from what I can tell nothing significant has changed as far as the missions go. They play exactly as they did during the beta. Something has to be different though, because the symbols changed a bit. Maybe something like a global average of how people did on the missions perhaps? I thought the star with branches signified spawn point during the beta, and really thought I figured it out, but now I find thats not the case. It'd be nice to get an official answer.