Thanks. I think I will go with the TM900.
Since no one's replied yet, I'll give it a shot. In reverse order:
Generally, if your primary interest is video, you will almost always be better off with a dedicated video camera.
I would guess that the TM900's 3 sensors and faster lens would give it better low light performance.
E.U. models of the FZ150 are limited to 29 minute takes, U.S. models are not.
Assuming day games where you can use a small aperture to give you deep DoF, I don't see why the FZ150 would have a problem maintaining focus. But you may want to disable AF so it doesn't hunt unnecessarily, especially since the FZ150's more stills friendly form factor will probably result in less fluid movement when shooting video.
HTH - Mark