an Avernus DLC is real and there's major talks in the dialogue about us being back sooner rather than later/telling people to keep their place ready for us because we will be back soon.
Either way, GANG! TIME TO REEL OVER AND KEEP REQUESTING A PROPER AVERNUS DLC!! Since this epilogue is a canon event 6 months post-game, the likelihood of them adding anything into the game that changes the dialogue for said epilogue (giving them even more work to do, in a patch they just released) is rather unlikely. But what is likely is everything they seeded, planted and watered throughout the entire epilogue section. Whether you play as Origin Karlach, romance her or let her go back to Avernus with Wyll, there's always a choice for whom to play in the DLC.
Hell, even Flo as a lead in is mentioned. Imagine the awkwardness of meeting HER in-game!
