Upgrade policy?

I’ve plugged the Scrivener sale on Facebook, but didn’t know the upgrade policy, which is probably relevant for Mac users, given the impending 3.0 on the horizon.
I assume people who buy a week (or two or three) before a new release get automatic upgrades, but can anyone confirm that? What about those of us who purchased a few years ago?

Read here: https://forum.literatureandlatte.com/t/important-note-regarding-our-update-policy/25536/1