Nice. Thanks for the info. Wasn't sure of the difference. Will just stick with the UF-13Link for preorder:
http://topqualitycigars.com/Drew_Estate_UF4_2015.html
They're a touch stronger than the UF-13 if you're really paying attention and smoke them back to back (or they were a couple years ago when I did it), but not worth the chase or the extra cash for that difference, in my limited experience. It's basically a UF-13 in a T-52 wrapper, from my understanding.