It's a damn shame that they were bound into those awkward positions in DP 117, or I'm sure they would have looked at each other like that ;-)
Hee, now I'm really happy I pimped Shaami's art. Welcome to the club! =D
Here's how I think it'll go down.
First we need an episode (Rocket focus or otherwise. I think it'll be a non Rocket episode personally) where they finally realize how they feel about each other/the audience is made painfully aware of it, because the writers love to foreshadow events like this.
Then we'll go on for a few episodes where blatant hints will be thrown around so all the kiddies can figure out what's going on.
Then a Rocket episode title and description will be revealed (because we all know how crappy Junki titles are. We'll most likely never figure it out by title alone) where it's obvious that this will be the episode where Rocketshipping will become canon. (And Junki WILL be writing this. I have 100% faith in that)