Well, to be fair, I don't know if either side's status will outright be ignored. I mean, if the story wants to have any integrity at all it would have to acknowledge that Batman is engaged and WW is with Steve again. I may think even just bringing it up again is goofy, but if its at least acknowledged that they're in different, happy places now and its just brought up as the past, then they can get away with it without ignoring anything. I may hate the idea like poison but I'm reasonable enough to admit that if its done in a way that doesn't undercut what's going on now, its not that big a deal. This only becomes a problem if he pulls anything like Rucka did with BN and A, it actually did completely avoid Selina and Steve, and/or B, actually tries to undercut the current work for both characters current love lives by their main caretakers by making this "spark" something current.
Who knows though, maybe it isn't even relevant to the plot from a POV of anything actually being brought up. Maybe its just sleight of hand innuendo like creators used to do with SM/WW back in the pre-FP days. If its something like that then it probably wasn't even worth bringing up in the first place. But since he did make a point to bring it up I'm imagining it has to come up in actual dialogue or something.