This news was posted on the scifi.com boards by user "koenigrules", who is involved with a weekly BSG webcast that includes interviews with castmembers and inside info. That is, he's a fan who has connections, and could be considered a reliable source, though of course, nothing is official until we get a press release from TPTB:
Here's the latest info from lvrocks tonight.
Filming starts the 3rd week in March on the first 10 episodes of BSG; then a month hiatus; then filming on the last 10 episodes ensues.
Air dates in Fall of 2005 on Sci-Fi.
Also, just a 1% drop for Litmus ratings- from 2.48 to 2.46.
Sci-Fi says the ratings are "healthy & stable."