As of today, all of the official Microsoft Lync Mobile clients are now available. Now what? Well, unfortunately unless you are running Lync on Office 365 you can not just load them and login. First, you need to install the latest update for Lync Server, Cumulative Update 4 (CU4), which you can download here.
Second, you need to install and configure the mobility and autodiscover service, which will also entail getting a new SAN for your Lync public certificate and external DNS changes for outside access. Jeff Schertz has a very comprehensive and easy to follow installation guide here.
After that is complete, you are ready to get the clients:
Windows Phone 7: http://www.windowsphone.com/en-US/apps/9ce93e51-5b35-e011-854c-00237de2db9e
Android : https://market.android.com/details?id=com.microsoft.office.lync
iPhone: http://itunes.apple.com/dk/app/microsoft-lync-2010-for-iphone/id484293461?mt=8
iPad: http://itunes.apple.com/dk/app/microsoft-lync-2010-for-ipad/id484222449?mt=8
At the next Dallas / Fort Worth Unified Communications User Group meeting in January, we will discuss the mobility service installation and have all versions of the new mobile client available to play with. I hope to see you there.
Thanks, Tom
The Lync 
Does not seem to be compatible with the Samsung Galaxy tab 10.1..