From the press release:
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As a fully supported deployment platform, developers can now use Unity to drive development of the best games to iPhone's massive mobile market and beyond.
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Unity Technologies has created an iPhone beta program that will provide hands-on support to drive 3D content creation and deployment of mobile games. Game developers who are interested in joining the iPhone support program should contact Unity
It doesn't say if it will be an add-on like the Wii support or part of a future Pro/Indie standard release.
