Wow, what a month March was! Unfortunately due to COVID-19, Disney had to close down all of the Walt Disney World theme parks, the resorts and Disney Springs and as of this writing, they are still closed. The March 5th and March 12th pins were released at the parks as normal, but the parks closed on March 15th so for a while, no one was sure of what would happen to the rest of the Limited Edition releases.
On April 9th, Disney started selling the pins on ShopDisney.com. They released several pins on April 9th and they will be releasing the rest in little batches throughout the rest of April.
Here is the monthly releases sheet for March (just for reference):