Well, I bought (Rented!) Hollow Men
and it has the new frontispiece with the "Thanks for Buying this eBook." I deleted/archived Articles of the Federation
to see if that would download an "updated" copy. I redownloaded it and got the same copy of the book, sans chapter markers and with two very small cover images. Not sure if AoF wasn't updated yet or if the updates will be on new ones.