I wonder why she did that?Its looking more and more anti against the pairing
Kishi is using this to mess with pairing fans.

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On a serious note- I think Kishimoto just wants to bring in every fanbase he can for these 10 chapters, so he's just creating suspense.
As for why Sakura pasted over it... I don't know either. Maybe, she feels insecure deep down when it comes to Karin, so she did that? I also wonder how she even got the picture in the first place. Obviously, Sasuke gave it to her but I don't see why he'd give his supposed wife a pic of himself w/ old comrades. It'd make more sense if it were just a pic of himself.
I guess we just have to wait and see.