This is from the Harry Potter website HPANA this morning:
WB: "confident that Emma will be back"
Recent tabloid reports this weekend have reported that "Harry Potter" actress Emma Watson had signed to do the remaining movies, yet others reporting that she had resigned from the role. This morning Warner Bros. stated that "We're extremely confident that Emma will be back for films six and seven." Which means that until official word is announced Ms. Watson is still attached to the movies.
The last thing I read is that her reason for possibly not returning is school. She really wants to continue her education, which you can't fault her for, but it would be hard to replace her. She does a great job. As far as her contact with the boys, it wouldn't be surprising since they are very busy themselves, Daniel showing off his bod in Equus and Rupert doing other movies and tv. I don't think it is animosity, I just think the tabloids like to play anything they can get their hands on up a bit.