Corporate Communications Pro
Be prepared to do a little bit of everything. The whole point of an internship is for you is to get direct experience about how PR is practiced in the real world vs. the classroom. Some of that experience may be hands on and some may be through osmosis by just being around folks doing the job on a daily basis.
A large part of what you may be asked to do will likely center around research. Helping account teams develop targeted media lists. Looking at the industry players to see who may be good targets for new business efforts. Activities along those lines help interns learn about the business, how to determine who is a good target for pitches and who isn't and what trends are driving the tech market.
I wouldn't expect to be drafting too many press releases or developing a lot of client-related content. It's important to rememeber that PR firms bill their clients for the work done on their behalf and it can be hard to justify giving client critical assignments to the intern. But at the same time, I also wouldn't expect to just be doing coffee runs - or even doing them at all. There's always something to be done on a client account and the good internships will find a way to slot you into the mix in a way that makes sense for you and the business.