The source of this news is Google+ post by Bradley Horowitz, Google+ Product VP. He announces his new position in this statement: “Just wanted to confirm that the rumors are true — I’m excited to be running Google’s Photos and Streams products! It’s important to me that these changes are properly understood to be positive improvements to both our products and how they reach users.”
Google Plus was originally open by invitation plus in June 2011and caused everyone with a Google email address to create some kind of profile. In October 2013, Google saw 300 million monthly active users but now in 2015 Google+'s rapidly declining traffic has caused Google to begin to phase it out as they did with "iGoogle."