I think one of the meanings of the Opera House vision is that Baltar and Caprica are going to end up raising Hera. Roslin isn't long for this world. As for Athena and Helo, I sorta expect them to get killed somehow per my theory. Both Roslin and Athena are racing to catch Hera. They both fail as Caprica picks up Hera and takes her to Baltar.
Any other meanings are still such a mystery that I don't dare to speculate. What I've written may be way off. *shrug*
I kinda hate that in trying to wrap up everything quickly, we aren't getting details. We aren't privy to what Kara's Leoben is thinking or whether he spends any time on Galactica. We aren't privy to how Gaeta's mutineers have been dealt with. We aren't privy to how Tigh dumped Caprica. We aren't privy to what Head!Six is telling Baltar anymore.
I did like the last episode, after a super weak one and one that took its time to get to the point. I just wish we could spend more time with the details that BSG used to tell.
I'm still eagerly awaiting the finale. I think some of the eps this season took a little shine off, but I'm still a fan.