I would love for there to be some hint of sparkage but an out-and-out romance? I don't know. For one, I'm constantly afraid that if they emphasize too much of the romantic aspects in the movie, the filmmakers will balk at the idea of an interracial romance on the big screen and cast Aravis with a White girl.
Then on the other hand, it's the rare scriptwriter that writes a romantic action movie without turning the girl into The Chick. Aravis is co-hero in the story along with Shasta and she shares the protagonist role with him completely, writing down to narrating her own escape story, and having her own separate adventures when they pass through Tashbaan. But present day Hollywood is so incompetent when it comes to feminist and racist issues that I shudder to think what they would do to Aravis if they emphasize the romantic relationship.
So sparkage, definitely. After all, I was 13 when I read HHB and I knew somehow that they'd end up together so I'd like to see that hint of something-more on screen. But anything more than that? I don't know. I also would like the kids to be close to their ages in the book 11 (Aravis) and 12 (Shasta).