Simon,
1. I believe one of those nice HHers from Norway did a video of the iPad App, put it on YouTube. There is a link here somewhere. It's good but could be better, controls track selection, pause skip etc, allows playlist creation etc, allows volume control, that's about all.
2. It is connected to a network and you can Rip CDs or import audio files from a connected PC/Mac using Meridian's ControlPC/MAC software.
3. Someone knows better but I understand very low jitter/noise output.
4. Don't know.
5. See below.
YouTube: Meridian Sooloos iPad App review (MC200)