It's not issued until 19 February, but we know that there are four new stamps, being the 1p, 2p, 81p and 97p on gummed paper, litho by International Security Printers. Unfortunately the selection of stamps once again means only one set per book, so dealers and collectors wanting singles are likely to be using the remainder for postage, so look out for them.
UPDATE 4 Feb: Now that we have stock I can show the microscope pictures - more will be on our website later this week.
The 81p from this book compared with the sheet stamp issued in March 2014, and with the 68p from the Roald Dahl prestige book:
There appears to be no noticeable difference between the stamps in the book and those in sheets, including the A-Z of the UK Bletchley Park and the Britons of Distinction Alan Turing. All were litho printed by Cartor, perf 14½.
UPDATE: Chris H has sent this UV picture which shows that once again the 1p stamp has an orange glow from the ink. This also happened with the 5p stamps from the First Airmail and Dr Who PSBs and the 1p and 5p from the Football Heroes PSB.
UPDATE: Publicity pictures from our website to show what Jonathan is referring to in the comments.
Pane 3 with £ missing from the £1.47 !
Pane 4 with £ missing from the £1.28 !