Subtle dig at the Star Wars Original Trilogy, mayhaps? (Personally, the Luke/Vader thing was great, but did anyone else happen to think that the whole 'oh, you mean the Princess I saved just happened to turn out to be my sister... and once again my so-called Jedi Masters waited until they were dead or dying to tell me - AFTER WE HAD ALREADY KISSED and how the hell did Vader never find out despite sharing a planet with her for years, being three feet away when she was Tarkin's prisoner or having access to all the Imperial records, including her medical records, anyway?' thing was way too contrived?
It was like George suddenly decided "You know what? Having to save him from a slug crime-lord isn't enough angst for the Leia/Han thing, let's make her and Luke siblings so that Han can completely misinterpret things and think that despite exchanging 'I Love Yous' on Bespin he and the Princess have nothing between them.")
Sorry, ranting again...
"This is all so... right. What if it's a dream?" "Then we remember when we wake... Remember and find each other."