since noone actually responded to your question, and assuming you are talking about on servers, i began testing our configs against trusty some time ago. I'm not going to switch right when it's released, but I am eager to move to it. You're going to get lots of things that you may have had to work for in 12.04, like a newer kernel and newer versions of system tools and libraries and your key server software, from OpenSSL to nginx/apache2, python, ruby, libc, etc.. The LTS cycle works, and I encourage you to begin testing as soon as you can, and in the future to test while it's in testing simply because you can - it's not expensive to throw up an instance here or there.