You guys just have to hang in there, apparently these things move all summer (note: just from word of mouth, I have no inside knowledge). It's just an awful thing to wait, trust me I know. I'm also entering the class a quite a bit of time after my undergraduate degree is finished, so I've been waiting and not giving up for a long time. I'm sure you don't want to hear it, but about four years ago when I started this I sat down with a few people and they told me to my face I would never get in. The point is, don't give up. Of course that is somewhat of an empty assurance coming anonymously online but I've been waiting, so to speak, for a looong time by my standards, and at this moment those years are finally all worth it.
As for letters of intent, I wrote a very nice email after I interviewed, updated my info a little after, and then checked back in sometime in March. For me though, I had emailed Upstate (and many other schools) a year before I applied asking questions and seeking advice, and they were one of the very, very few schools to respond back. I really appreciated that, and when I was there I tried to track down and thank everyone in the office. My interest was pretty well laid out, but it meant a lot to me that in one of my moments of panic before I even applied that some schools actually would take the time to help me out. Very surprised/disappointed by the amount of schools that did not.
So from a somewhat 'older' applicant, don't let this patch throw you off course. It's not worth it.