They announced that quite a while ago. They've just definitely announced
that it will be available in Spring.
It's not part of the Dragonslayer Series. Legend of Heroes 1-2 were part of
Dragonslayer, but 3-5 were part of a separate series called "The Gagharve
Trilogy" and are completely different from the first two. 6 will begin a
new trilogy. It looks a lot different from 3-5. Dragonslayer really hasn't
been gone for that long. 5 was released in 1999 and the remake of 4 was
released in 2000. If you didn't bother to play 3-5, then I don't see why
you should care much about 6, man. Go get 3-5, they're all good games.