Update: just got word from Martin Wallace that the issues had been resolved and the game would be available at Essen. I'm guessing we will never know what was going on, but it's good to know the game is on its way.
In weird and depressing news, since I was interested in the game, Treefrog just posted this on their web page:
Slitherine, the licensees of Field of Glory: the Card Game have requested that we remove all mention of the product from our website and destroy the recently printed copies. Consequently, this game will not be available for sale, either at Essen or from our website. We have also removed all mention of the product from this website.
I'll note that the game has also been removed from the Boardgamegeek database. I've got requests in to both Treefrog and Slitherine for comment. I'll update this post when I learn more.
Update: Marco from Slitherine sent me this email this morning:
Hi Danny, thanks for pinging me.
The situation is fluid right now, so it’s a ‘no comment’ for the moment.
I’ll keep you posted on that.
By "fluid," can we hope that there is a way the project could still be saved? Hopefully, we will get a better idea when we here from Treefrog.