Well, not an official release. But TheJoe is looking for voice-actor volunteers to add voice audio to Monkey Island 2 using a tool called 'ScummSpeaks'.
You can read more in the threads here at LucasForums or here at ScummVM's Forums. The latter one has input from the author of ScummSpeaks, jestar_jokin and you can see his short 'proof of concept' demonstration here;
There's an earlier speech-hack demo by jestar_jokin here.