Possibly. If you rummage into the game data files, you can see references to a Fort Balfiera, and Balfiera is the island with Adamantine Tower on. I'm not entirely certain, but I believe the Balfiera map is what they use at conventions when they are showing that 3v3v3 (or is it 4v4v4?) battleground that people keep requesting is implemented. So, if all of these assumptions are correct, if they introduce battleground(s), and they take the same format as they have at conventions, then that may take place at Balfiera / Adamantine Tower.

Thanks for the replies. I had no idea that the battlegrounds hosted at the conventions were possibly held on Balfiera island, thanks for pointing that out