This is the page I will mainly be referring to; Chapter 450, page 6.
The thing is, when I read the hug scene I had a funny feeling on how Kishimoto had draw the panels (Did you also noticed it?). I mean, everyone was happy and thankful to him; Iruka so proud because the lonely child had finally won the acknowledgement he had longged so much for; we saw Hinata crying relieved because he was safe and Sakura, who felt deep relief and gratitude (calling him rash while hitting him because she was so worried, and hugging him touched because he hoped for him to come and save the day and that's exactly what he did).
We saw a such display of emotions on everyone part, and yet, on such an important time for Naruto what we got to see of Naruto's reaction?
Nothing.
The most we got to see Naruto's shock just before Sakura's hug. And it's not 'till several pages later that he appears visiting Tsunade and finding out about her condition. It got me thinking isn't it funny we didn't get to see Naruto's expresion or read Naruto's thoughs on the situation at all?
Now, if we see page 6 of the chapter we realize something: we don't get to see Naruto's reaction but everyone else do so (excep Sakura, and Kakashi?). Even thou I'm deprived of any direct evidence on the matter I suspect he's not just shocked the entire time about it but also somehow happy about everyone recognition, and deeply touched and even embarrased? by Sakura's undeniable act of affection towards him.
So I suppose my point is What was Naruto's reacction to Sakura's hug?
Whatever it may be it was showed to everyone but us. It was showed to Hinata.
Thanks to recent chapters we do know now for certain that Naruto loves Sakura. We also know Hinata loves Naruto. And here is when I think an important factor comes to play: timing. It's important because this scene happened just after Hinata's spectacular confessiĆ³n.
And if you look at the Hinata's expresion to the hug (the next first frame) her reaction is subtly different from everyone else's. Yes, it's true everyone's smiling, but Hinata is not just smiling; she's thinking deeply about something as implied by the suspension points in that word balloon.
Maybe Hinata has understood something? Maybe she has already understood her feeling's are unrequited?
It's nothing sure but to me Hinata's smile in that page is somehow different from everyone else, I don't know very well how to describe it, it kind of reminds me of the sad smiles Naruto gives Sakura so often.
I could see this leading to the moment Naruto will have to finally answer Hinata. I can see clearly Naruto trying to say something, finding it difficult, and Hinata cutting him off and replying with a "I know." and getting a flashback seeing Naruto's face when Sakura's hugged him.
I hope I made myself clear, english isn't my mother language =)