Microsoft is planning to release the Lync mobile client for various platforms soon. The PowerPoint presentation below come from a Microsoft presentation this morning. Microsoft confirmed that this information is not NDA and can be shared with others, so here you go!
Lync Mobility will provide a mobile client for Windows Phone 7, iPhone, iPad, Android and Symbian devices. There is no ETA for these clients at this time. Microsoft is dependent on the various partner marketplaces for actual client availability.