Couple things I wouldn't mind seeing in a future vol;
I think tackling their relationship from the more Gambit centric side would be interesting. I'd recommend using Laura in a more little sister role. Have her no be completely sold on the idea of Gambit being back with Rogue. Not from a jealousy standpoint, but more like a bratty little sister. For all intents and purposes, Laura has only heard of the two together, never been around with them as a couple. Let her ask the hard questions, but more from protective stance of Gambit. We've had other characters (and creators) do the same for Rogue. Laura can ask Gambit "why are you doing this again?" It could be both rhetorical and real as Laura may not be all that familiar with romantic forgiveness.
Oli and Becca; their son and daughter from the "The End" timeline. We've seen the couple get wrapped up in time travel exploits before. Perhaps bring back that Princess Gem thing. Have them glimpse or briefly visit that future timeline. Get some reactions from them and even tie up Oli's issues with his father. He blamed Gambit for Rogue's death. Give the character some closure and I'd love to have KT write Rogue's reaction to meeting her possible adult children, probably something she never thought she'd have, then given hope, just to have it ripped away again when her powers got scrambled back in UA.