What changed with the Mystery Box Upgrade and Easter 2015 updates?

drbywho wrote:
Does that list of items (lard lad, squeeky teen, etc) mean they're the only prizes in the new mystery box?

Lard Lad Donuts: 2%, Blue Haired Lawyer: 14%, Kearney: 7%, Springfield Tire Yard: 14%, Channel 6 News Van: 7%,<br/>Itchy Scratchy Billboard: 7%, Squeaky Voiced Teen: 14%, 30 Donuts: 1%, 10 Donuts: 2%, Chalmers' 1979 _ONDA: 7%,<br/>Bomb Shelter: 7%, Minnow Pond: 7%, Khlav Kalash Stand: 7%, Lemon Tree: 6%