In my opinion, C.C's true wish is simple. To be loved.
When she received her Geass and the love of everyone around her, she could no longer differentiate between what was true love and what was love brought about through the use of her Geass. Therefore, my theory is that C.C's wish to die is not something she had at the start, but rather a wish which came about after centuries of isolation without knowing what love was. Faced with a neverending cycle of loneliness and suffering, C.C gradually came to embrace death as an escape from this. However, I believe that her original wish was simply to know what true love is. And that is where Lelouch's role lies.
Sad though I am to say it, it looks like a Lelouch X C.C pairing looks inevitable.
I wouldn't say inevitable, but the chances of the pairing have slightly improved. I don't want a pairing between lulu and new C.C though, she acts like a 10 year old girl lol..If she would get her memories back AND survive...then I wouldn't mind lulu x C.C happening. It's my fave after Lulu x Kallen.
To be honest I think they'll have a strong bond, just not as lovers. She wants to be loved, that doesn't mean that they'll have to become lovers. Friends and 'family' love each other as well.
I still prefer Lulu x Kallen and I think Lulu x Kallen's chances are still higher. They've been building up that pairing throughout season 2 and the coming events might help this pairing as well. The animators had to get her out of the way for the Shirley and C.C developments and this might mean that they'll save her development for last. Kallen is the only one of the 3 girls that Lelouch hasn't kissed yet, while they've come really close twice and neither seemed to mind the second time. I think this this means that we'll see a very romantic moment/kiss later on in the show. Why show us those teasers otherwise...
We'll have to wait and see though. They could go either way at this point.