In doing some trolling on Amazon today, I came across the listings for DC’s Before Watchmen books.
Last February I guessed that there would be 3 oversized hardcovers, but it looks like there will be four:

Before Watchmen Vol. 1 HC by Darwyn Cooke and Amanda Conner (July 9 2013, $40)
Collects BEFORE WATCHMEN: MINUTEMEN 1-6 and BEFORE WATCHMEN: SILK SPECTRE 1-4, 264 pages

Before Watchmen Vol. 2 HC by Brian Azzarello, J.G. Jones and Lee Bermejo (July 16 2013, $40)
Collects BEFORE WATCHMEN: COMEDIAN 1-6 and BEFORE WATCHMEN: RORSCHACH 1-4, 256 pages

Before Watchmen Vol. 3 HC by J. Michael Straczynski, Adam Hughes and Joe Kubert (July 23 2013, $40)
Collects BEFORE WATCHMEN: NITE OWL #1-4 and BEFORE WATCHMEN: DR. MANHATTAN #1-4, 256 pages

Before Watchmen Vol. 4 HC by Len Wein, Jae Lee and John Higgins (July 30 2013, $40)
Collects BEFORE WATCHMEN: OZYMANDIAS #1-6, “Curse of the Crimson Corsair.” 256 pages

But before all that DC will be offering a new edition of the original – Watchmen: The Deluxe Edition HC on June 4 2013.
This book will include sketches, extra bonus material and a new introduction by series artist Dave Gibbons.

Of course DC is still adding on to the series with the upcoming:

• Before Watchmen: Moloch (2 issues)
• Before Watchmen: Dollar Bill (One-shot)

and DC has yet to collect:

• Before Watchmen: Epilogue (One-Shot)