Unfortunately this is the wrong forum. You must of been looking for the General RPG Discussion forum. I believed it was moved, and now D&D 5e is at the top.
It is isle of Dread. But I don’t have any other info.
Did they make enough $ from the Keep on the Borderlands book to justify continuing the series? I like and appreciate the first book, but really would like a slimmer book with just the 5e version plus the essays and perhaps copies of the covers. I don't need all varients of the 1e module reprinted.