Over at the Autumn Moon Blog 2.0, Bill Tiller has said something more about the new game, although not much. Here’s a summary:

It appears that Ghost Pirates of Vooju Island is indeed the game previously known as Teal Harvest
Monkey Island is just one of the inspiration sources, but there are loads of other major sources of [...]

As mentioned on The International House of Mojo, Adventure-Treff have posted new information about Autumn Moon’s new game, which is likely the one that was code-named Teal Harvest. Now, since a lot of you probably don’t speak German, I took the liberty of translating it:
In the upcoming issue of PC Games (in stores from Wednesday on) there is a preview of Autumn [...]

That’s the acronym for Autumn Moon’s new game, which is code-named Teal Harvest: Terror Beyond the Act or Power of Forming a Mental Image of Something Not Present to the Senses or Never Before Wholly Perceived in Reality, and it will actually be released before A Vampyre Story 2. The release date for Teal Harvest isn’t known [...]