I saw this in the litecoin forums
“Hi folks. Sorry to dampen enthusiasm. I read the zerocoin paper and heard from core Bitcoin devs on the topic. Their opinion is that it is incredibly inefficient in block storage use. If Bitcoin adopts it or something like it then we may import it as part of a standard code rebase in the future. Litecoin’s own development in the next few months focuses on stability, security, user education, vendor integration and enhanced smart fees to allow lower fees with strong anti-spam protections. All of these goals are to improve Litecoin’s usefulness as a medium of exchange in commerce, which in the long-run is the only way to enhance its inherent value.”