From the Wizard101 website:

New Spring Update!

There’s a fresh spring aroma in the air, and it’s not just Nana baking cookies over in Karamelle! To celebrate freshly cut grass in Wizard City, flowering fields across Aero Plains, and those yummy Karamelle cookies, this year’s Spring Update is now available with tons of exciting new content!

We've introduced new items, events and event rewards, and improvements on many adventure systems. A couple of quite challenging new skeleton key bosses also await you. Need a friendly guide to explore it all? We’ve also added new social systems (with more to come) to help you connect with fellow wizards.

The 4th Arc Continues! Players who have completed Karamelle can also now pick up a new mainline quest, "Old is New Again." in the Arcanum. Uncover lost mysteries that set the stage for our next world release! ...

See the complete Announcement here: