Rather than rotating characters, cafes in Tokyo and Tokushima will be all Assassin all the time
Ufotable is famous for offering special themed menus and items based around their anime at their cafes in Tokyo and Tokushima. However, these event specials will no longer be rotating to honor the birthdays of characters from series such as Fate/zero.
From now on, it's all Assassin all the time.
See the Fools Strike Back intro video and site take-over pics...
In terms of other Type-Moon April Fool's, there's also Tsukihime's second stringers being elevated to star status.