So, I now have a copy of this, thanks to my friend who was at Comiket and is completely awesome and fantastic.
First off, no, I'm not scanning it. I don't need Rikdo mad at me.
We get the two 'hot springs' one-shots from YKO post-manga here, expanded greatly to serve as a 'wraparound' for the doujinshi itself. Everyone is nude. Including the men. Aside from this main part, there are several 'tributes' from various artists, and also Nabeshin, who gives a page-long textual thank you.
The doujin ends with the original ending of the manga from YKO, which was rewritten for the tankobon.
There is no explicit content in the doujinshi beyond the constant nudity you'd expect from hot springs scenes.
There was also a one-page small calendar given away, with pictures of Excel, Elgala and Hyatt, as well as two elf-eared girls who I believe are from his Deathless series which is running in Young King.