720p25 is no officially supported format in general.
Only 720p50 is a real standard. However there is a
so called 2:2 pulldown where you double the frames,
also called 25p over 50p. This only concerns a
transparent video signal via HD-SDI. Speaking about
the Panasonic HVX200 is another story as this is a
file based workflow.
Here you can find an article how to capture, edit and
monitor 720p50 in FCP 5.1:
http://www.aulich-adamski.de/en/perm/720p50-capturing-editing-in-final-cut-pro
This is also helpful for JVC GY-HD users that could use
an HDV to HD-SDI converter.
An second article describes the Panasonic P2 workflow
with 720p25 and 72p50 but it's currently only in german:
http://www.aulich-adamski.de/perm/panasonic-ag-hvx200-720p2550-p2-workflow-mit-f inal-cut-pro