XDDD Kishi does love tormenting people! I've been waiting for 5 years for NaruSaku to happen, but there are fans who have waited even longer than that - maybe even the full 10 years since Chapter 3!
I just hope it won't be 10 more years before we see Naruto and Sakura get together...Actually, Sakura is already nice enough, I think. She's protected Naruto, worried about him, spent time with him, laughed, etc. It's simply that she didn't realise how much he loved her, maybe even the extent of her own feelings towards him. It's probably harder to notice the changes within yourself when they happen slowly over a long period of time. It almost always takes a third party to comment on the changes.
Your take on Sai's line "...but what about you?" really did shed light on an alternative meaning.
It wasn't necessarily "Sakura suffering because of Sasuke" or "Naruto suffering because of Sakura", but it could be him asking who Sakura is crying for. Logically, her "realisation" line means that she realises she's crying for Naruto, that Naruto is the one closest to her heart, not Sasuke. Hopefully!
Well, we should be able to see the scene in its full detail tomorrow, so we can hopefully draw fuller conclusions.
*glances over at OneManga* It annoys me when I see One Piece already up, but I know Naruto won't show up for hours. XD