Here's a list of Forthcoming Titles (please note that all dates are subject to change) :
MAY 2013:
Snowy Owl (Poyser Monograph)
A Photographic Guide to the Birds of the Cayman Islands
The Mandarin Duck (Poyser Monograph)
JUNE 2013:
Birds of Mongolia
Mammals of China (paperback version)
JULY 2013:
Birds of Africa Volume 8: The Birds of the Malagasy Region (September in the USA).
The Warbler Guide
Pterosaurs
AUGUST 2013:
SEPTEMBER 2013:
Peterson Reference Guide to Seawatch: Eastern Waterbirds in Flight
Primates of the World
OCTOBER 2013:
African Raptors
NOVEMBER 2013:
The Crossley ID Guide: Britain and Ireland
DECEMBER 2013:
Rare Birds of North America
TBA: Sibley Guide to Birds (2nd edition).
Pigeons and Doves of Australia
2014:
Birds of Ecuador
Birds of New Guinea (2nd edition)
Birds of Taiwan
Birds of Brazil
Birds of Argentina
Hummingbirds of the World: A Photographic Guide
Birds New to Science
The Barnacle Goose
Dawn Chorus in Eden
Birds of Ecuador
Birds of the Guianas
Handbook of Western Palearctic Birds: Passerines
2015:
The Eagle Owl
Antpittas
Peterson Field Guide to Bird Sounds
TO BE ANNOUNCED:
Raptors of Mexico and Central America
A Field Guide to the Birds of China
Birds of Paradise and Bowerbirds
Collins Field Guide to the Mammals of Africa
Wheatears
Woodpeckers of the World: A Photographic Guide
Peterson Reference Guide to Woodpeckers of North America
Peterson Reference Guide: Birding by Impression
Birds of the Southwest Atlantic & Antarctica
The Crossley ID Guide: West, Warblers (with Alvaro Jaramillo), Ducks (with Jessie Barry) and mystery guide.