I plan to be ready to discuss the assigned case on the first day of class; which, by-the-way is expected. You can go online to your schools site and find each prof's book list, reading list, and case assignments for the first week of classes, some even post their entire syllabus. I also plan to be ready to discuss the assigned case at the admitted students day later this month.
Aside from those two cases briefings/discusses I will not be doing a darn thing to prep for law school, aside from drinking heavily and sleeping. I currently work at a large law firm, and all the advice (solicited and not) I have received has been to stear clear of anything law school prep related, because there is absolutely nothing you can learn/change now that you don't already know and it will only stress us out even more.