I agree with you Eric about the mods and had not thought about that when I made the original post. In terms of adventures maybe a "Carnival of Swords" type mod in both ARG and 5E versions. Perhaps make it the same product with combined stat blocks in the back? Not sure if that's easier or harder than two separate products though. Should we do a survey on facebook for what non mod products people want to see? I would not mind a hinterlands book as well since that's place rife with adventure sites (and Censure as a great base of operations as well as a site for urban adventures).
On one level though it makes sense to tie some new products into whatever storyline is being run at the moment. While I imagine the War of the Paragons will focus on the Blessed Lands it might take us further afield into areas that could use sourcebooks.
But having said that revising the crunch books (Magic of Arcanis and the Psionics book) might be useful as well. There are plenty of people who like crunch and fluff in equal amounts.
Finally Akira's comment about the need for a 2nd edition of the core rules with errata added in is probably something we need to look at this point considering the amount of errata there is.