There was a hope that it might be published in some dead-tree format, but that's all stalled, and I've had no reply to e-mails. So, since I do have permission from Issaries to post the material free-of-charge to my website (so long as certain legal disclaimers are included), and in the interests of not clashing with the release of official publications, that's what I've done.
If you liked the Book of Glorious Joy, and wondered what I made of Seshnela, you can find my thoughts in Kingdom of the Flamesword. As always, the non-canonical nature of the work must be stressed, and no challenges to copyrights or trademarks are intended - this is just fan material, nothing more and nothing less. It will certainly be contradicted in official works, and, if that matters to you, this won't be of much use. It's also worth noting that at least some of it was written for HQ1, which was the current edition at the time, and may put some people off.
But otherwise - well, hopefully it will be useful to someone.
Update: Kingdom of the Flamesword, updated to the current version of what is now QuestWorlds, is now available for purchase at DriveThru RPG, along with Forged in Blood and Snow, which does the same for the Kingdom of Jonatela.