have USB and HDMI.
MiniDV tape camcorders (whether consumer, prosumer or professional) has DV/IEEE1394/i.LINK/firewire. Examples start with the Sony HDR-HC9 and Canon HV40... there are lots more - but they are all more expensive. If high definition is not needed, the Canon ZR960 is out there.
ALL camcorders have analog AV output.
From your description, you want a "portable television studio". Those studio cameras do not record locally. The cameras are connected to a video switcher, the video switcher connects to the "network broadcast"... Audio is handled separately. Sometimes with mics mounted to the camera - more commonly the audio source has its own audio connection (mic'd or otherwise).
At the low end, analog video surveillance cameras feeding the video switch;
At the medium area, IP addressable video surveillance cameras into a web server (like the ActiveWebCam application);
At the high end, there are various studio cameras (either staffed with a camera person or remote controlled) that feed a video switch.
The problem I have seen with camcorders put into this studio camera role is they have a tendency to go to sleep after a while.