I won't mind if there was a Edolas spin off though who will be the mind characters the characters I can think of is Edolas Lucy/Edolas Natsu which funny just to see Edolas Lucy manhadle Edolas Natsu throughout the Edolas spin off. Which I will admit Edolas Lucy manhadling Earthland Natsu/Edolas Natsu was my favorite part of the Edolas arc.
The first novel if not badly remember, is like a Spin Off of Edolas, as they mention aspects of this.
Equally something that would complement what happened in those years would be interesting
I would also love to be apart from a Sin Off, it would be a Fairy Tail Databook, not something that only a couple of Data like Fairy Tail Magazine, but explain their skills in full and in some cases height, weight, important dates, temperature , velocities, data from FT zones such as the Cube of Tartaros or Tenroujima Island.
That would be great as well.
Even so the ads can give them in the Comic Con, hope the New York can press for information about possible Spin Off or the new Manga