The Lego Simpsons minifigures series just arrived at the Bricks World JEM store today (May 7, 2014) and I collected 2 boxes this evening. Thankfully, I had placed and paid for my orders last Friday, because I didn't see any boxes open on display for people to buy.
On the shipping carton, it states "Do not put on shelf before May 1st, 2014". Upon opening the box, you are presented with 3 columns of 20 packets. Since I was distributing 2 sets to friends, I cut a small slit to check for the character in the packet and recorded down the distribution.
The distribution in the box was as follows:
|Homer||Chief Wiggum||Mr Burns|
In total, you get the following quantities in 1 full complete box:
Mr Burns 3
Ralph Wiggum 3
Chief Wiggum 3
Hope this helps. I will post more photos later!