2. The Development of Sam and Quorra's Relationship
The relationship between Sam and Quorra isn't a matter of "will they, or won't they", but a matter of "when will they, and will it last". Remembering that we're in a Disney movie after all, you can reduce that to a "when will they"; and judging by the final frames of Tron: Legacy, we've probably answered our own question. Horowitz and Kitsis avoided the stereotypical pitfalls of an adventure couple in love by sparing the schmaltz and letting the relationship between the two protagonists bloom on its own through subtle implication. They didn't need to harp on the point too much, because in the end they knew we expected as much and could fill in those blanks with our own assumptions. Now that we're progressing into further sequel territory, it's time to (as the kids would say) put a ring on it. Let's go deeper into the relationship between these characters and watch them develop even further as a couple. This doesn't mean to slather a Tron film with romantic cliches, thus creating a "Tron Rom Com" (which would be hell to attend a convention for) and dooming the franchise to mediocrity. The writers are also the creators/show-runners of Once Upon A Time, which seems to be able to balance humor, heart, and action rather harmoniously. Legacy showed us the beginnings of a world that could explore emotion as well as action in equal turn. All they really need to do is keep steering the ship in the right direction, and add some more depth to a relationship that's already there.