So as part of Telltale's roundup of previews for Tales of Monkey Island Chapter 5: Rise of the Pirate God, there was this article from BigDownload.com. Particularly noteworthy is the second page, which contains this quote:
"Remember to grab the demo right here on Big Download next week Tuesday the 8th -- the original voice of LeChuck, Earl Boen, is back!"
(Also, while you're at it, do check out this Chapter 5 preview, which contains a few new screenshots. Beware of SPOILERS therein, though.)
UPDATE: elTee has thoughtfully pointed out that the same article we linked to above (and scandalously skimped on reading) indicates that Tuesday's demo is in fact of Chapter 5 gameplay. So Earl Boen in Narwhal might not be coming so soon as we first thought. There's always the DVD...
UPDATE 2: Jake from Telltale comments!
"Earl Boen definitely recorded a demon LeChuck for Ch 1 (as obviously indicated by his voice appearing in the trailer). I don't know when it will be released, though."
So there you have it. The Earl Boen dialogue for Narwhal is fully recorded, but the release date for an updated version of TMI Chapter 1 with his voice work is undetermined as of yet.
I hope he doesn't feel sad.
By the way, am I mistaken to think that the Season Trailer footage of human LeChuck saying "I'm... I'm human!" on his ship near the Rock of Gelato was new as well? I seem to recall that in the original version he just stood there silently after becoming human, though I really could be wrong.
"I'm...I'm human!"
"That's debatable."