Our hosting company (Schlund) informed us about the .mobi time frame:
Sunrise Phase 2 (Trademark Sunrise)
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Start/End: 12 June - 22 September 2006
Duration: at least 2 years, after that yearly renewal

Landrush Phase (Live Registration with increased pricing)
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Start/End: 26 September - 10 October 2006
Deadline: 26 September 2006
Duration: at least 2 years, after that yearly renewal

Live Phase
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Deadline: 11 October 2006
Duration: at least 2 years, after that yearly renewal

For more information see our earlier post.