I took the LSAT for a second time this past Dec. Since I had a reportable score, I submitted a couple of applications during November. The schools have already received my LSAT report, but are holding the evaluation until they get the Dec. LSAT score. When the score comes out, do I submit the score from LSAC.org myself? or do the schools somehow retrieve or automatically receive the new score update? Will I have to submit a new LSAT report or just the score? And if I have to submit it myself, is it going to cost me another $12?
Thanks.

I can't answer all of your questions, but I don't think it will cost you another $12. In a previous cycle, I sent the LSDAS updated transcripts and more LOR, and most schools requested additional reports without me even knowing. I assume the LSDAS sent them some sort of update. If you look under the tab with your reports you can see what schools have requested, when they requested it, and when it was sent. I had schools request my transcripts from the spring after I applied (even if I was already accepted or rejected).