I haven't heard anything about Gaiden except the drama on Sarada's birth (not details, just bits and pieces). I'm not going to touch that Gaiden stuff with a ten-foot pole. I signed off everything Naruto except NaruSaku months ago. As far as heard, the series is sinking deeper and deeper in the abyss with every chapter.
But ... and I say this with dread ... is there anything to know that's good?
I think there's some good illustrations of Sakura, both angry (pursuing Sarada when she thinks something bad has happened to her) and maternal (with long hair, talking to a younger Sarada in their kitchen). So, surprisingly enough, there's been more storyline about Sakura when I expected Kishimoto to forget about her completely.
There were two Naruto panels I liked, the one a few posts above about "Let's go save your mom," and the one where he's angry and looking directly at the reader upon overhearing that Sarada might have Karin's dna instead of Sakura's.
But the rest of it is nonsense. I don't find it as painful to read as I thought I would after the end of the manga. Instead they all seem like fun-house mirror reflections of their old characters. Everyone's behavior is exaggerated or purposeless or retconned into oblivion.