As you may know, Google released a first API (application programing interface) for Google+.
Unfortunatly, the first release of Google+ API doesn’t allow us (devs) the grab important informations from G+. It would only show what you posted yourself in public, and you can send any information to Google+. It’s useless.
We need to wait for Google to release a better API.
Once it will be done, I’ll be happy to add Google+ support in Pure messenger.