Fostex has announced the AR-4i – an audio interface for iPhone 4 dock connector.

The device offers stereo microphone inputs with AD converter that improve the audio quality of iPhone 4’s video recording, video streaming and audio recordings.

Features:

• 3 microphone inputs with plug-in power for vertical or horizontal use.
• 2 x cardioid plug-in microphones come as standard. Third-party microphones can be used.
• LED Level Meter for input level monitoring.
• Microphone gain control.
• Headphone jack for input monitoring.
• 2 x AAA batteries for more than 10 hours operation.
• External power can be fed via USB.
• Screw hole provided for optional camera gears such as tripod, grip etc.

This is set for release this summer. Pricing is TBA.

Looks like this could be a good option for podcasters, if the price is right.