I want to know:
1. How Kally will react when she finds out the Chief is a Cylon and that her baby is a half-breed.
2. How the whole Lee Adama thing will play out now that he's a private citizen.
3. How long it will take for more cylons to say "y'know what? let's just stop killing the humans." (likely the D'anna, Six, and Boomer models... notice it's all the women who are sympathetic and the men who are generally the evil-er ones...)
And, honestly, I'm actually looking forward to the ending in the hopes that it's wrapped up cleanly. I like being able to look forward to an ending without worrying that they're going to leave plot threads hanging just in case they need them. DS9 was probably the best SF series I've seen that had a concrete ending -- Sisko and Garak die, Odo leaves, Kira takes over the station, and the Federation gets to rebuilding after the Dominion War. Many of the others either had crap endings or were cancelled before they truly COULD end. (And were on Fox, coincidentally...

With the way Galactica's been handled so far, and the fact that it's not on a network but on a cable channel, I'm less worried about it being cancelled.