Detective Comics No. 1000 is coming out on March 27th. The first story of the 96-page issue will introduce a new team called the Detectives Guild. It is a team created by Scott Snyder and Greg Capullo. the team consists of Hawkman, Hawkgirl, Martian Manhunter, Elongated Man, the Question, Detective Chimp, Slam Bradley, Traci thirteen and of course, Batman. Not many details have been released about the team, but it will center on Batman's training to becoming the world's greatest detective. CBR.com's article on the issue is here.
article on a site called Resetera. Not sure if this is a one-shot deal or if it will continue in Detective Comics for a while. Stay tuned.