Just hold the svideo cable up to the ext port, and the ext port will sense it and transform into the correct socket. This works for a number of other cables such as Ethernet, HDMI and Parallel Printer. Amazing things they do with technology now days.
No, the hardware can output S-video and composite only. The Pandora will be available at the same online shops that sell it now, as well as a few others. If you want to get one from the first batch, there are still a few left. You can email openpandorasales@gmail.com for ordering instructions.