Having interviewed at Temple last year, I think I can give some insight on this issue. First of all, that 5 minute presentation that they ask you to prepare, dont spend too much time on it! When I interviewed there, they didnt even mention that presentation, and in the end no one had to do it. I have no idea why they would ask us to prepare a presentation, and then not even bring it up on the interview day....******ed! Who knows, maybe this year, they will ask you to present, but dont be surprised if you are sitting there with all of this interesting stuff to present and end up not using it.
As for the group interview, our applicant group (of 5 applicants) was split into 2 interview-groups. The group with 3 applicants had 2 interviewers, and the other group of 2 applicants (my group) had 1 interviewer. Bascially, we were asked a question, and we each took our turns in answering. Point of advice: dont hog the stage!! This will not look good in the eyes of your interviewers, so be gracious with sharing time between you and your fellow applicants. I think the main reason Temple uses the group interview is to see how you interact with potential classmates. So when you are answering the questions be sure not only to address the interviewers, but also the other applicants (ie make eye contact with everyone in the room). And dont worry, because your in a group, the questions wont be too personal, so you wont be talking about grades or anything that may include personal info.
Good Luck!