Update: Syfy released it exclusively to Mo Ryan's "The Watcher" blog but Mo said no problem since "exclusives are measured in nanoseconds these days!" so it is now included above.
Here's her math about the 1 hour reduction:
The series will premiere with a two-hour pilot that is already available as a standalone DVD. Eight additional hours of "Caprica" will air through March. Then the show will take a break and the remaining nine hours of "Caprica's" first season will air some time in the second half of 2010.
If you've done the math in the previous paragraph, you've realized that "Caprica's" episode order has been reduced by one hour. Syfy had originally commissioned a total of 20 hours for Season 1, but the show, which is currently in production on the last third of the season in Vancouver, will now consist of 19 hours.