As you already know for sure, Google released some hours ago some Google+ API, so I decided to create really fast a Sencha Touch application to test them out and they works really great.
Here I post a picture of the Activities view.
The application is almost completed (layout apart), and I think I will release on github for free to help you with Sencha Touch development.
At the moment the application features are:
Request and complete the OAuth2 authentication process.
Display the public Activities showing actors avatars, pictures and video attachments.
Display the user informations.
I will complete it in these days.
Here's the work in progress screen: