Hi, with a couple of week late, Microsoft Lync 2013 SDK and UCMA 4.0 SDK Preview are now available.
You can download it here:
I hope I will find few time to try all new things 
Some of the most exciting features included with the Lync Client Platform SDK are the new user interface controls for WPF and Silverlight. The controls establish their connection with Lync Client automatically, thy talk directly to the client, there is no server configuration to do !
The controls are with the default look-and-feel which emulates the behavior of the Lync desktop client, but like any other WPF or Silverlight control, they can be customized by either restyling or retemplating.
The available controls are:
| ContactCard |
|
ContactSearch
ContactSearchInputBox
ContactSearchResultList |
|
CustomContactList
CustomeContactListItem |
|
MyStatusArea
MyPresenceChooser
MyNoteBox |
|
| PresenceIndicator |
|
ScheduleMeetingButton
SendEmailButton
SendFileButton
ShareDesktopButton
StartAudioCallButton
StartInstantMessagingButton
StartVideoCallButton |
|
| ContactList |
|
All those controls are available in the Visual Studio and Blend toolboxes.
I'll post some more interesting how to use and customize the Lync controls.