I have been informed today that there will be at least three Prestige Booklets next year, it is not known if they will contain any Machin definitives.
The Provisional dates (including Prestige Booklets) for Machin issues in 2011 in order of release date these are:
11th January 6 x 1st-class stamp book - FAB -Thunderbirds
24th February 6 x 1st-class stamp book - British Heart Foundation
22nd March W W F Prestige Book . this will be printed in litho by Cartor. (From Ian Billings via comments) "The final pane will have Machins surrounding a label with the WWF panda logo."
22nd March 4 x 1st-class Large & 4 x 2nd-class Large booklets - cover design change?
March 31st for 3rd April Tariff change - New Machins & Country Regionals
5th May Morris and Company Prestige Book (Litho Cartor)
14th June 6 x 1st-class retail stamp book - Thomas the Tank Engine
9th September Centenary of UK Aerial Post Prestige Book