Curse Mark Susanoo...Nice..!
I think it was a real treat seeing the first kage. That alone made the chapter worth it to me (and Curse Mark Susanoo) Now, if we ever find out what Sasuke Sarutobi looked like, it will be complete.
I do hope that Orochimaru look-a-like has some link to Orochimaru. He is still the only heavy hitter who has not had his own flashback. He's been there since the beginning and we still know almost nothing of his past, where he came from, and what set him down such a twisted path. One of the things I love about Naruto, is that it shows young ones that all evil has a source. You are born a blank slate that can be painted any color. Every villain has a story leading up to what they are: Even if they are forever beyond approach and reason, it all started somewhere.
Also @PaulBee, I hope your guess is spot on. I can only imagine what it would look like if Sasuke and Naruto did what Madara did back in the day.