The cover of Card Captor Sakura Clear Card arc #6 has been announced:
Volume 6 theme is purple!
Both regular and limited special edition will be released on April 3rd. The benefit of the special limited first edition will be a CD with the audio guide for the Card Captor Sakura Magical Art Museum exhibit and a booklet about it. The audio guide is voiced by the anime voice actors.
You can already pre-order the special edition on Amazon Japan.