There is a list of required immunizations in the 2012 Logging In booklet (p. 22) that is still posted on the KP webiste. The link is at the very bottom of the home page. We used the the 2011 instructions as a starting point for our daughter last year. There will be some changes, but it gives you an idea of what to expect.
I second kpmom2011, if your appointee doesn't have a passport, start the process immediately! And do look into the TWIC card. We didn't receive her packet until May, I think. To us, it seemed we had very little time to get everything together and we were glad we had been directed to the older version on the website.