My two cents about this:
I think Boston still recommends Top to Mew, and I think it is clear that Top is still the same playboy and plays with maybe both Boston and Ray? Because in the trailer we can see Top having verbal and a bit physical exchange with Sand.
In the old trailer Ray had a thing for Mew, but from this new trailer I am not sure that he is having swoony feelings for Mew, I think they changed it to Top?
As for the endgames...
All couples are toxic, but I have quite different opinion from others regarding the endgames. I think Sand and Ray will be the only endgame in this, because they started of toxic, will probably go through hell, but I still think they're gonna get their brain cells back and somehow solve their problems - Ray will forget his ''crush'' on either Mew or Top and will properly date Sand.
Why I do not think Mew and Top will be the endgame? If this series is hardcore and portraits real life, than we all know how cheating is something not everyone can forgive, and Mew looked very hurt, but who knows? Maybe I am wrong and he is going to forgive Top, but I prefer if he didn't. Since first trailer I hated Top and still do, 'cause he a trashbag, but yeah...just my opinion.
And Boston and Nick....
I doubt Boston will get his brain cells back and turn out normal, so I do think SandRay will be the only final endgame.