Playbill reports that Stephen Sondheim (Follies, Sweeney Todd) is at work on a brand new musical. He is apparently working with playwright David Ives (Venus in Fur, All in the Timing), and has 20-30 minutes of the new show completed.
There is no current time frame for when the public may see the new work or what the subject matter is.
I for one an SUPER excited to see/hear a new Sondheim musical. Especially with David Ives writing the book.