Hi-Fun's gloves are Bluetooth headsets -- or, well, handsets -- with the speaker built into the thumb and the micin the pinky, so you can talk by doing the traditional "call me" hand gesture.
Mikey Digital includes a guitar adapter for connecting instruments such as guitar and bass to the multi-source 3.5mm input jack, which also accepts stereo line-in and mic-in.
For various reasons, everyone likes to talk about the "analog hole" problem with DRM protection: pretty much all security falls down in the face of a well positioned camera and mic setup in the back of a movie theater.