I actually think Part 2 would be most likely to be called Reunion and they'll wrap up that part of the story pretty quickly before we move onto Meteor and Holy. Maybe the third part will be called Regenesis. I predict the story will reveal that the Ancients summoned Meteor to destroy Jenova.

I also predict that Rufus is the secret leader/financier of Avalanche (with the goal of assassinating his father and becoming President).

Also, Shiva, I disagree. Aerith and Zack's deaths no longer have the same meaning and impact as they did in the original game. Unless Square Enix handles the approach differently. Also, I believe that if they do off Aerith, it will be in the third installment (yes, I'm holding to that). Giving us two whole games to utilize and grow to love her (and a second foreshadowing) before ripping out our hearts in the third game.