Its just after 10PM here in the UK and I see the home page says:
Day: Wednesday, May 18th
Game Worlds: (1 - 3) Closed
Start: Approx. 08:00 CEST
End: Approx. 12:00 CEST
Adventures & Premium: Times will be extended
The changelog will be published at a later date. With this update, the remaining event resources will also be converted.
So at 8AM tomorrow morning BB are going to push through a game update and the changelog will be published at a later date. It beggars belief that a commercial organisation can feel ok about treating its users with such contempt.
A part of me things its better to publish the change log after the change as it gives BB the chance to see what else they have messed up and to explain them away as new features or just ignore them.