Tobi != Obito. That theory has been thrown out a few times now.
The fight was pretty conclusive. I liked how it started to rain and water dribbled over Sasuke's eyes so you're not sure if its the rain or him crying. I like to think he was shedding a tear for his departed brother, and rather than collapsing, he lay down next to him, but that's just my interpretation.
As for Jiraiya vs. Pein, I hate to say it but I think Jiraiya is dead, if you recall he did send the messenger frog out and I remember one frame where it was in shot in Konoha. The open ended-ness of the fight is with who or what Pein is. Which was especially annoying since Jiraiya figured it out before he died (and decided to keep it to himself!)
Anyway, looking forward to next week.