Spoiler Zone in the Events forum is probably your best bet currently.

Closer to the time, Howrse will probably set up a topic for them.

Thank you - I've been trying to look at the spoiler zone but im finding it difficult looking through it to find exactly what I'm looking for!

You can potentially ask for a page number. Someone might know. If you're given one, it will probably apply to Classic not mobile.

We only have the images, we won't know their perks until their pages are loaded in. Pack divines and new divines released through weekend offers are not tested, so we don't know their perks in advance.