Batman/Superman #26 will be an issue that was written by Jeph Loebs son Sam Loeb who sadly passed away this past June. Here is an excerpt from Broken Frontier.com:
"Everyone will be working off of Sam's plot. This is his story to tell. Helping out with the writing will be myself, Geoff Johns, Alan Heinberg, Brian K. Vaughan, Joss Whedon, Brad Meltzer, Joe Kelly and Mark Verheiden. The artwork -- so far -- will be handled by Mike Turner, Joe Mad, Jim Lee, Rob Liefeld, Arthur Adams, Joyce Chin, Pat Lee, Ed McGuinness, Carlos Pacheco, and Ian Churchill."
All the artists and writers are donating their fees and royalties to Sam's High School and the pages will be auctioned off for even more chairity.
To read the full interview with Jeph check out BrokenFrontier.com