Highest tier patrons will keep all stuff, others, well, you either say goodbye to the time-limited content, or ... you will have to buy a dlc with that content.
Keep all stuff? You do know that just because highest tier patreons get all "Season passes" They will still need to grind to unlock stuff, you will still need to buy outfits with likes, you'll still need to open lootboxes for animations, you'll still need to grind that one daily per day we get, you'll still need to log in every fucking week to check out the rotating store and hope it will have the outfit you want to buy.
Even if you've been a long time patreon, currently unless you've paid lots of fucking money, you still won't be able to unlock everything that is currently in the game with the patreon pledges converted into likes and insight.
I don't know what the new outfits costs but probably 100 likes each that's 10 dollars right there that you've needed to pledge.
To unlock the old outfits its at least 130 dollars needed to be pledged to get all outfits on the first version of harem mode release, add in the new outfits now and its probably just below 200 dollars needed to be pledge for all outfits and that's just outfits, you don't even have likes left to spend on unlocking animations.
This is also not counting the new outfits that will be added during the closed beta, then the early access or whatever, by that point it you will probably have had to pledged +600 dollars to get all outfits it would not be a huge surprise.
And as I understand it the Character bundles that will be released to unlock outfits and animations won't be given to high tier patreons anyway.
So you'll need to pay if you want to skip grind even though you've paid at least 95 dollars already for the highest tier