Naruto
Good chapter, I missed the classic Kakashi battles where he analyzes and figures an opponent out. This chapter confirms that Tobi is using Obito's eye. He could still potentially be someone else, someone that it makes more sense to want to control the world. Kakashi would be upset that this person violated his friend and took the other eye which would justify Kakashi being there, if not as much as if Tobi is Obito. That said, it could also be Obito for the full drama between he and Kakashi, but Kishi would both have to come up with how Obito's body recovered as well as his motives for controlling the world, not coming back to the leaf, etc. etc. Seems the former theory would fit much better without a bunch of potential plot holes. Admittedly, any other character wouldn't have as grand an impact on fans as they would most likely be a new character such as Madara's younger brother as an example. I guess we'll see. I wouldn't put it past Kishi to make it Obito and have some inadequate answers for the aforementioned questions.
One Piece
Interesting development with the fruit. Lots of speculation can be had on if it's a transference as we've always been led to believe that the fruit just grows somewhere else after the holder does. I suppose we have never been given a lot of information on devil fruits and I was never sure if Oda would bother explaining them more, or if it's just a series constant that you accept as part of the world and it's not a focal point beyond being a power up for people in the world. Hopefully we get a detailed explanation soon. As for the note Chopper received, that has to be Monet. Law got me excited at the end, time for the counter attack, indeed! I imagine Kidd will end up teaming with them again as I can't imagine any other purpose for him and Caesar is assaulting the entire island.
Reborn
Looks like Reborn is heading in the direction of past shounens where most of the characters that were decently strong and contributed earlier in the series, have now become useless. Gokudera or whatever his name is and the sword guy couldn't even attempt to delay their opponent, instantly had their weapons destroyed. Pathetic. Lucky for them the hyper trio showed up but yeah, if Tsuna's family all becomes worthless, how much longer will this series go on? I already mentioned it felt like we're nearing the end anyway with the Arcebelano and Vindice plots both being fully explained and resolved this arc. Not really anything left besides making Tsuna the official Mafia boss.
Still need to read HSDK and Fairy Tail if it's out.