Although there is no set date yet, Stefan Keuchel, spokesperson for Google Germany, has responded to a Twitter question revealing that a Google+ application is coming to Windows Phone. Specifically, said Twitter user asked Mr. Keuchel the very direct question of when and whether or not there will be a Windows Phone Google+ application. The conversation actually took place in German, and of course Google Translate was put to work. Stefan Keuchel responded just as directly by stating there is no date yet but it (Google+) is coming.
Hopefully a future Windows Phone update will integrate Google+ as well, just to bring another network to easily share to into the Windows Phone world.