I always thought that Quinn should have been a love interest. Not because she's my favorite character, but just because she feels as important to the story as the other LIs and she has a similar chemistry with the MC. Also, even though Sage is technically on the DIK side, we're missing a true DIK LI, and Quinn is definitely that. She's the absolute counter to Jill is how I see it.
However, I think in the preview Quinn is supposed to represent the "Others" path, which could mean she plays a more prominent role in that path, but I doubt she will ever be exclusive. She will probably never be truly represented as a LI either, imo.
i will never get why so many people here think that the "DIK" path is similar to being an asshole or some sort. Its not... The MC doesnt really act like an asshole on the DIK path (like Dawe is one for example or even Tommy... the MC is much more "softer" than Tommy or Vinny at the DIK path, by far). Just a little more rough, blunt, and not so good manners... that is about everything, he is not really a BAD person as a DIK, not in the slightest.. Quinn has definitely an evil side at her, and is bullying others and not lightly... even on the DIK path the MC doesnt do that so much and especially not that seriously... just a little. Compared to Quinn he is MUCH nicer as a DIK.
And with the life Quinn choose for her, there is no such thing possible like a serious LOVE relationship... so no... she is not a LI per definition.
Maybe you can say she becomes a main-fuckbuddy or so. But love with relationship attached? Naaaah... some people here giving way to much importance to the new banner.
I would say this banner doesnt show the Love-interests in the game, never did... no, the banner just shows the Mainstory-girls, which is a difference. And it doesnt matter which girl you choose... every other girl will remain important to the game, if you ditch a sidegirl, she more or less isnt really present anymore, if you dont fuck Nicole, Lily or so... they are not that much present anymore in the game and only have very few scenes left only the maingirls are still very present, her lifes are attached to the MC in a way, no matter what, and thats why they appear in the banner...
And i think Quinn wasnt designed as a Maingirl early on. Her part in the first season wasnt that big. She has not really more scenes than cathy, Jade and other "sidegirls" or so in the first Season... Her Role become just bigger, and i would say... DPC felt the way to make her a maingirl during development... or his Patrons voted for that cause she is rather popular.
But it would be VERY strange if she suddenly changes into a LOVE-interest... Quinn does not do "love" you broccolis! And that will not change so soon... and i dont think it will ever really change... i cant picture ANY game-ending with her riding lovely with the MC into the sunset. Her neck is already so deep in shit, she will most likely end up in jail or worse. Maybe she will realise near the end of the game that she indeed has fallen in love... but that is a big MAYBE. And if she realises that, i still cant see a good-ending happening for her. Only way for a somewhat "good" ending would be, that she turns on her famnily, becomes a police-witness or something like that... but to call it a "good" thing to turn on your family and get them arrested is a little streched. A really lovely-dovely ending with Quinn would feel very unbelievable no matter what. Yeah on her path, she likes the MC, very much so... but love is a whole other thing than this. And i cant picture her falling in love yet, there must be a 180° change of her character first... which is not impossible, but needs a lot more time. So falling in love would be only "plausible" at the end of the game i would say.