The Fifth Game is in fact Changeling. It's due out at Gen Con next year.
Secret Project Z is an all new modern-day RPG in three parts, not a part of the World of Darkness, called Scion. In the first book of Scion, you play the son or daughter of one of the old gods (Greek, Olympian, etc.), who have returned to the world with new goals and plans. In the second book of Scion, you play a demigod and in book three you play a figure vying for godlike power. Get ready for Scion, because it'll be here in the Spring of 2007.
Secret Project M is Monte Cook's last big project in the gaming industry, which we'll release at Gen Con next year. We can't tell you anything about it at this stage (except that it's gonna Blow. Your. Mind! Woot!), so for now we'll go on calling in Project M.
A couple of books are here at the show that almost didn't make it, but will continue to be available at the con in limited quantities: Circle of the Crone (we sold through two cases of that this morning in one hour) and The Great Pendragon Campaign, which arrives tomorrow (I think?) for the first time. Maybe if that book does really stellar in sales we'll follow it up with The Incredibly Awesome Pendragon Campaign and, eventually, The So Very Tight Pendragon Campaign That Gave Your Imagination Material Form as a Winged Knight Who Like Totally Rode Off with Your Dreams and I Think Found the Grail and then Slayed this Dragon that's Really Your Sadness and Left You with Like This Glow of Joy that You Know Will Keep You Warm for the Rest of Your Days, Dude, Limited Edition with Keepsake Bookmark.