Wondering how Google Glass interacts with iOS? Jason Tucker from Stabley Times put out this video demonstrating.
Before you watch it, it's worth noting (as Tucker does in the video) that there's not a lot you can do with Glass and iOS. You can't really do much beyond tethering.
Of course, you can still use an iOS device to show video of what your'e looking at with Glass, as this doctor that used Glass during a surgical procedure did.