The first book is a sticker book accompained by the theme of Valentine's Day in Thomas' Valentine Party while the second is a new Step Into Reading release with an Easter theme in Easter Engines.
The third is a colouring and activity book in Making Tracks while a Lift the Flaps will be released called Search and Rescue.
The last book called Off the Rails! will be a 3D release with 3D glasses included accompained by colouring activities. The image of Thomas on the cover has already sparked some concern as to why the titular character is smiling while coming off the rails.
The 2012 books will be released starting from December 27th 2011 with the first book while the last four follow January 10th 2012.
Thanks to SteamTeam3211 for the alert.