IK Multimedia offers up the iRig Mic unidirectional condensor mic and is designed for singers and vocalists, but can also be used to record speeches, instruments….See Details.
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The mic works with three official apps: VocaLive, which provides realtime vocal effects and processing, AmpliTube, which enhances instrumental recordings with effects and levels, and iRig Recorder
The mic uses the 3.5mm jack on the iPad/iPhone and has a second jack built in so you can plug in headphones for monitoring audio levels. It will cost $60 when it comes out. Pre-order Here