Can't help with pink but the purple ones are reindeer.

The updated Insular Mine is now called the Ice Mine. There is no available information that states whether waiting chests will vanish when the event ends or if you get the prizes regardless. I can ask though.

-The chest type that drops is no longer based on chest. The more blocks you break will help to increase a meter on the Mine page, and once you reach the marked points you get a different chest type. It's not clear how many blocks it takes to reach the Golden and Crystal chest.
It looks like this


-The chest opening times has changed. Wood chests now take 16 hours to open, the gold takes 20, and I think someone said the crystal takes 24. Boosters take 4 hours off the wait time.

-We were given no information about the divine mazes beyond the date it opens, which is Christmas Day, so I have no answers for these questions. Based on how the Divine Forests worked for the Tree contests in the past, I wouldn't assume it's limited to a certain number of players, or that they close early. It's just that they're not available to start until Xmas day and will last until the event ends. We should get to see which divines are in those Mazes on Christmas Day
-No one has posted pass estimates, and it will vary if you take detours and such. In past Mazes I've spent only 11-15 Titan's Challenges to finish, and those were about 4 Mazes. We'll probably have a better idea when the event starts

We only know about the Maze event, and now the Ice Mine event, because we are testing them. Unless Howrse posts a new spoiler in their Instagram, we'll have to wait until the next test session opens to find about the event after the Mine.

The map key will indicate which reindeer is in that maze, so if you already have a particular one you'll know not to go out of your way for it

As for the pink icons, I didn't make it to mazes 4+5 to know for sure, but I believe those indicate the divine portals as someone told me the portals were in those two mazes. The map key should say when the event starts.

It's not something we tested on preprod, so know one knows if, or when, we'll have it this year

Is the time for the release available on the site? Or just on their social media?

Alsviðr! I guess we're all going to see it in about 20 minutes but awesome. Does this mean I can fully blup a horse in a single horse-day? Yes please.

Hmmm, what about a coat that didn't use energy, such as Crazy Doctor dark side?
Would still take human time though!

Though please, please, no one post 100s of coverings from one of this coat... he can produce quite enough coverings in a day as it is!

no christmas pack yet? I though they were supposed to come out on the 11th?