Welcome, Joseph! Janny talked about the prerequisites for a Stormed Fortress hardcover edition in this thread.
I tried (admittedly years ago) to ‘revert’ the hardcover rights they had not used to open the way for doing a special edition. Got the NO.
It’s the same old story: numbers talk, and frankly, relative to other series, we don’t have them right now. Many series get ‘anniversary’ editions - Wars of Light and Shadows would be in it’s ‘Thirtieth’ anniversary (based on pub date for Curse of the Mistwraith) in 2023…if we could break the piggy bank in the numbers department, anything is possible. Best I can do is write the best finale I can to make this happen. Without the books being featured in shops – the series is invisible except by word of mouth. That pretty much handcuffs me, since self promo burns out readers faster than anything.