There is about two things I'm sure of right now. First of all, Orochimaru does not have a change of heart. I'm 98% certain that he is still very evil and definitely has something under his sleeve. Orochimaru's smart. He knew from the beginning that Hashirama was free so of course he decides to play the submissive "whatever you want, I'll do" act, even for Sasuke. He can't risk mouthing out his evil intentions. Saying that, he could've just left them be if he had no interest with them. Clearly he needs them for something, we just don't know the what. So I predict Orochimaru's supposed assistence and "good" attitude is just a ruse. The only honest thing I see from Orochimaru is that he's genuinely intrigued and interested by Sasuke's decision that vastly differs from his own. That's about it.
Secondly, Sasuke is not entirely good with the "Let's save the village for puppies and Christmas, I'll do the right thing" mentality he's outwardly displaying. Realistically, if Naruto couldn't get through to him, it's terribly forced and OOC to have him let go and suddenly not bear grudges. All of us have said this and I think Kishi is aware of this. Sasuke has
not shown he's forgiven the village and no longer hates his home. Knowing his character, he still has resentment towards it and can't forget it. He still hates the village, just not as much as before. Conclusion? Sasuke still would like to destroy it. He still hates the people, he still "hates" Naruto. What's happening here is that finally some logic is catching up to him through his emotional instability, causing him to rationally realize his revenge is misguided and pointless. He killed Danzo (which he doesn't and will never regret) so that's as far as he needs to go. But it's more than that. Sasuke realizes Itachi's sacrifice and how much he loved the village and that it would be a betrayal of his brother if he did the opposite. He does not share those feelings himself yet but wants to uphold it.
Do not see this?
Itachi was the one who caused him to want to protect the village, not himself or his bond to Naruto. This is a very, very vital piece of information. It means Sasuke's character development is incomplete and he's not redeemed. He has two more major steps to go through first. Sometime in the battlefied, he needs to acknowledge Naruto's sacrifice and genuine bro love for him and not in a sneery "You're pathetic" way. After that, it's T7 as a whole. And
finally, through the influence of Naruto, Sasuke let's go of his hatred and makes peace with himself and Konoha. He'll want to protect the village for Itachi, Naruto,
and himself. Only by this point will Sasuke's development be finished, will he be redeemed, and truly a good (albeit jaded) person.
So no, Sasuke's not suddenly good. He still has his own issues. He's more like 50% percent good in comparision to his previous 5% good in the Kage Summit Arc. Sasuke's on the right path to redemption at last but he has a few more hurdles (in the form of inner conflict) left to go. I disagree with the belief that Naruto was not involved in his redemption.
He will be, the emphasis demands it. Itachi was only the first half that created that 45% percent goodness in Sasuke. Sure, it might not be as flashy and satisfying as I might have liked but Naruto is going to be the final piece that "saves" Sasuke. I'm sure of it now.
The important thing is, for the first time in a while, Sasuke
finally got positive development. He's realizing to some extent the world doesn't revolve around him and that he was being wrongly selfish and immature. He
acknowledges this now, a stark contrast from his fixed outlook that he had the most painful suffering and the "right" thing was to make everyone suffer with him. He's not over his rage/hate but he knows it's wrong and wants to change. For Itachi. For the first time since the Chunin Exams arc, Sasuke is actually channeling selflessness and doing something for someone who sacrificed more than he did and he's not getting anything out of it. For someone as conceited and arrogant as he is, this is a good, impacting moment. As a Sasuke fan, under circumstances that didn't seem so rushed, I would be very estatic and overjoyed over this. I'm disappointed I can't be happier, it's almost my ultimate dream for him. If only Kishi had executed it better ...
I've come to terms with this plot twist after discussing this with my brother, I'm no longer angry with this very much. This is far from my favorite chapter but if my prediction is right, then I can be okay with this. I'm looking forward to the inevitable SasuNaru drama, Team 7 reunion 3.0, and the likely NaruSakuSasu resurfacing (I'm not worried about SS really, it's still IMO dead thanks to Sasuke's character).
Sorry if my predictions don't really make any sense, I still haven't fully absorbed this "Sasuke is no longer evil" concept.

It's the most unexpected thing Kishi has ever done and he's pulled a lot of these. Maybe after the break during the next chapter, I'd stop being in complete shock and denial, having "Did that
really just happen?" constantly repeating itself over and over in my head. You should've seen my expression when I first read the chapter, I was utterly stunned for at least 40 minutes.