So, if you want to read for yourself:
https://mtgazone.com/mtg-arena-state-of ... mber-2019/

Highlights:
Friendlist will come now, but no chat functionality - you can see online/offline and click challenge

Historic:
20 cards will be added now:


price-tag for those cards: 1:1 wildcards or full set (80 cards) for 3,400 gems (now)
looks like 8/20 are rare and 1/20 mythic, so 36 wildcards vs 3,400 gems

multiple events for Historic until next set release, when Historic will take a back-seat again

Pioneer shall come to Arena eventually - will take time.


My thoughts:
Pioneer yay,
Historic meh.. they reserve the right to always ruin my deck by adding whatever they want.

edit: correction, one of the cards is mythic.

They are planning to make more anthology sets of old cards. They aren't saying it, but it's implied they are waiting for the pioneer meta to settle a bit so they can figure out which cards are relevant enough to implement.

But no Mac OS implementation...