It seems that HTC Germany will be having an on-tour event. In their Facebook Page they posted the HTC Sommer Event showcasing the social networking phone HTC Cha-Cha. This phone was introduced back at the Mobile Congress 2011 and this event might be the place to launch this new social phones.
They are called social phones because they have a Facebook button. By just pressing this button you can access your facebook without using third party Facebook app or browser.