I would love if the game got into some real depravity. For example with Lena and Seymour (i.e. the Dubai trip, escorting, hardcore modeling or more...) or bondage stuff with Axel, breadcrumbs in that direction have been spotted...
The supposed trip with its three different destinations probably won't happen, at least outside of an ending slide showing Lena in an airport or some such. I think what you should read into that conversation is more that Lena can emphasize materialism and glamour with Seymour (her posh variable) and doing so will take escalating requests from Seymour in order to stay on his payroll.
So far these requests have all been about Lena pleasuring herself to Seymour's whim, right? Unless that changes I think the main direction that will go is that Seymour will expose Lena more publicly, not as in the middle of the street, but perhaps during social events with other "elites". My assumption has been that dramatic developments will occur whenever that happens in the presence of Axel and/or Ian.
It would even lend itself to a spin-off/sequel focusing on a corrupted Lena and an innocent younger protagonist (kind of like Holly) where you can repeat the cycle or return to the light. But sadly none of this this will happen. First because EK already said this game will be more tame than GGGB, though I don't know why cameos exist then (this only invites comparison) and secondly because the narrative structure (conflicting branches with Ian) prohibit this.
I wouldn't bet on Eva making direct spin-offs either. In spite of the recent deluge of cameos Eva very clearly wanted this game to be a separate thing from GGGB and all indicators during her Q&A's have suggested the same will be true of whatever next project she comes up with.
I'm not opposed to more perverted content appearing, really I think Eva has been somewhat slow with getting to anything really interesting recently, though the var epilogue was nice for that sort of thing. However, the Jack scene for example, more than anything, showed that people find it jarring when these perverted scenes come about artificially.
I have really wanted Lena to become more sexually expressive for a while, I personally dislike that everything has to be introduced by Ivy before Lena makes any moves. We got some options recently, groping Emma, getting with Jack and Marcel, flirting with Eli, so I kinda hope the bar scene will become one where Lena can explore casual sex again and hopefully Eli comes back for a scene or two in that regard too. I very much appreciated Lena actually coming across as an openly bisexual woman for once.
Hopefully we get some interesting content with Billy as well, and ideally that content doesn't depend on prior routes so those of us who don't fuck all the pricks from the early game can get in on the action.