In Amsterdam this week Trans-Dimensional Portal is sharing an ambisonic experience with anyone lucky enough to be in the area. The demo was shot in 4k resolution on a Red One camera and an ambisonic soundfield captured by a Core Sound TetraMic. I bet it looks and sounds great.
Perhaps Dan Hemingson's $9 ambisonic microphone experiments are more friendly to the home hobbyist. Add a multichannel USB soundcard to an iPad via a camera connection adapter and this could be mobile surround field recording.