Niantic has recently announced that they will be testing out rewards that are given from Raid Battles, and Egg management. They have said that they will be conducting these tests in the United Kingdom and Ireland and that the effects will be temporary.
The testing will begin on Wednesday, December 9th, 2020, at 1:00 p.m. PST (GMT-8) and will end in the first days of January. As for testing for Egg management, they will be on a global level with some Trainers and will have two variations. In both of them, Trainers will have +3 Egg slots from Adventure Sync.
In the first variation, all of the 12 Eggs will be in the same section, while in the second variation, the rewarded Eggs will be stored in the “Bonus Storage” section, which can be found in the Egg storage tab. The testing will begin on Friday, December 11th, 2020, at 10:00 a.m. PST (GMT-8). The end is not announced yet.
As the testing develops, they have said that they will be including more Trainers from every part of the world.