The recurring theme of brotherly love coupled with strong emotional extremes, loss of that love causing the extreme passion of pure hatred and thus great power, the betrayal of ones closest comrade (Madara v.s Hashirama; Sauke v.s Naruto). I love the way the past and future are so artistically tied together in this manga as it is in the real world.
Tobirama's disdain for the Uchiha was a bit surprising but not to be unexpected seeing as he had to fight them his entire life and watched as Madara caused his brother great pain (I suspect Hashi and Madara had a similar relationship like Sasuke and Naruto and Hashi was loath to fight his beloved rival and friend).
Hiruzen admitting to ordering Itachi to kill the Uchiha was another shocker because I thought for sure that Shishui's Kotoamatsukami was the leading cause for his radical like actions.
Hashirama is so like Naruto it's hilarious, LOL! The God of Shinobi is a bit of a simpleton, LOL!
All in all I loved this chapter and can't wait until next week's. Now I'm curious about what Sasuke is going to do next after he gather's all of his info...