I've made some fairly decent progress brainstorming and planning for my new story that I'll be adapting from my old V:tM story. All in all though, I think I'm going to avoid getting to in depth with my planning at the moment. I've realized that putting too much thought into this particular endeavor is distracting me from the current Pathfinder campaign that I'm running. I don't think it's fair to my players for me to skimp on the story for my game for something that I can easily work on after the campaign has ended.
So I'm going to keep this story on the back burner for the mean time and try to focus my creative energies on my Pathfinder campaign. The game is somewhere between 2/3 and 3/4 done, and my players do have a tendency to surprise me by rushing through the story faster than I expect (though sometimes the opposite is true, too ).
When my game is finished, I'm going to do my best to take a break from running any games for a while so I can honestly devote my brainpower to my new story. In the meantime, I'll be working on fleshing out the setting a bit. It's a simple enough task that it won't distract me too much from my campaign, but also a very pivotal step in figuring out the overall story once I'm ready to start working on it.