I think there was only one other thread about this, but not much information was uncovered. If you haven't played the game, I might leak out a few scenes so don't read if you don't want to.
Now, Rikku and Gippal are my favourite couple from X-2. But I always wondered, were they a couple before? You know, when they first go to Djose and Gippal says something like "Yeah we were quite the couple".
And also, in Chapter 5 after chasing the moogle, Rikku is talking about how her heart pounds in her chest when she thinks of someone and it might relate to Gippal but we never find out... *pout* Any ideas? Maybe someone even went as far as to ask SE about it?