Re-opened. It turns out that due to a lack of communication on my part the verification for this feature on Android actually used the BridgeIt camera, not the HTML5 camera. Thus, we haven't been able to verify that the camera is actually toggling between front/back as desired, since all the none-mobile platforms we've used only have a single camera attached.
We'll need to re-think the current mobi:camera behavior to force BridgeIt to be used when on mobile platforms before we can verify this further. That will be tackled under new JIRAs.