Temple has been doing the group interview for awhile now. You will be asked specific questions, so answer those well when asked, be professional (don't cut others off, talk too much, etc) and you will do fine. Everyone at Temple is great and really makes you feel comfortable. I interviewed at a bunch of schools, and if you can get past the neighborhood (which is great for patients, you will do a lot more procedures here than most places) then this really is one of the best schools in the country. Just relax, be yourself, and everything will work out for you. You got an interview, so you deserve to be there, remember this and you will fine.
p.s. So far Temple has over 2,500 applications, so feel good about your interview invite. It is competitive and you are one of the best applicants. Congrats.