The VOIDRUNNER'S CODEX is coming! Explore new worlds, fight oppressive empires, fend off fearsome aliens, and wield deadly psionics with this comprehensive boxed set expansion for 5E and A5E!
Just one last thought, you can download some of the delves as a PDF from the RPGA site as long as you are a Herald level GM. I haven't looked lately, but I know at least one or two are up there. You can take a look at them and get a better understanding of what they are in the current form.
No, that's not it at all. Dungeon Delve (note capitals) is a book full of dungeon delves. Dungeon delves are like mini-dungeons. See Firelance's quote above.