i think that most of the movies today have a franchize clause in their contracts with crew, and only the most successful actually go with it for real, plus i think it's a pr move against the other SW movie, to get the pressure even more.
i have no issues with Kristen taking up the part, she is pretty enough and i think she will finally show her talent (well, i expect her to do so in OTR even more), but we'll see...i'm def more up for Charlize/Kristen version and i looove the dwarfs cast! too bad there were so much issues with Viggo that he let go of the project.