I think there will only be three trades this year, and they'll probably come out very close together (my guess is one in July, one in August, one in September).
Plus, there might be the third volume of Baltimore in December.
- B.P.R.D. Hell on Earth ― Volume 5 (The Pickens County Horror, The Transformation of J.H. O'Donnell, The Abyss of Time?)
- B.P.R.D. Hell on Earth ― Volume 6 (The Return of the Master?)
- B.P.R.D.: 1948
2014 will have an explosion of books though. There are four books so far that could possibly come out January or February alone. (Abe Sapien ― Volume 3, B.P.R.D.: Vampire, B.P.R.D. Hell on Earth ― Volume 7, Lobster Johnson ― Volume 3) Given the current schedule, I'd expect at least 4 more before 2014 is out. It'll be a big year for trades!