Do you maybe have PCOM-GA confused w/LECOM-B? Bradenton is the only school I know of that is strictly PBL, but I haven't researched all schools. I am, however, applying to PCOM-GA and I have not heard of it even having a PBL option. Its curriculum, if I remember correctly, is based on that of PCOM-Philly.
Here is my understanding of PBL thus far, not having actually seen or experienced it personally. PBL, in short, is a case study based style of learning, as opposed to strictly lectures. It's a very independent form of learning in that you have to discipline yourself to really dig into the material, but you do have the resource of a small group to work with on the case studies.