I checked the morse titles again and was confused for a moment, because there was only a single new letter, but then I remembered that last time I checked them you'd released the titles of many parts without the parts themselves.
Hmm, so the next letter is S then. Probably gonna go for a third SWAN. I wonder if you're going for something like SWAN SOUGHT SWAN LOST SWAN FOUND. But it could be something completely different, too.