It has been announced that the PGL will be going down June 5th through June 21st while they perform the upgrade. You can see a small preview of the new design in the picture above, looks fairly similar with a few minor changes. There will be a new area in the Dream World called “Cool Hole“, confirming that Black 2 and White 2 will also be able to connect.
There’s also a new “Report” page which allows you to see different statistics. Make sure to wake up your Pokémon before the maintenance starts, if you don’t you won’t be able to remove them from the Dream World until the site re-opens. Also, Berries left in the Dream World will now be “absorbed” and disappear if you don’t log in for over 100 days. Scary 🙁