They're here: new expansions on the upper left purple plots!!
They go to a new animal (seemingly earth-fire judging from the colours of it) called the Solar Bear!
The habitat cap has been raised too: for me it now shows a cap of 76!!!
More details to follow later: good luck to those who have hung in here waiting for precisely this moment!
Goal screens for expanding to the Solar Bear:
And there it is! The new animal, the Solar Bear.
Rarity: Super Rare.
Breeding and incubation: 18 hours.
Evolution time: 20 hours.