New Extra Birds Feature
At last, Stella has joined Angry Birds 2. But not only that, but we also get a sneak peak of a new feature: Extra Birds. This new feature will allow you to select one of 3 Extra Birds to join the Angry Birds 2 Flock on their adventures; whether it's during the Story, in the Mighty Eagle boot Camp, in the Arena, during Clan Events, or (maybe) Hat Events.
Right now, Stella is the only Extra Brd available, with 2 more Extra Birds coming soon. In order to unlock Stella, you need to collect 60,000 Pink Feathers (replacing the normal feathers during the 6 day event where Stella is locked), or wait 6 days (wait until next Thursday, October 25th, 2018).
There is also a 4 day Stella Level Event (similar to the Hat Events), but Stella must be unlocked first, so the key to play the Stella Level event is to gather the 60,000 Pink Feathers as quickly as you can. Do so to unlock Stella, you have earned the right to take on the Stella Level Event.
Stella's ability still remains unknown. That is, until she is unlocked. So if somebody manages unlocks Stella early, let me know what her ability is in the comment section, and maybe display an image / video (video most recommended) of Stella being used in gameplay.
As for the other 2 Extra Birds for the new feature, we have yet to see who they are. So, we'll just have to wait and see!
Anyway, good luck!