Out of the 10 million consumers that have purchased a PS4 more than 5 million people are active PsPlus subscribers. This was announced during the IFA press conference in Berlin by no other than Kazuo Hirai.
Another numbers was mentioned. 53 million users around the world use the psplus, video/music unlimted or another Sony service.
PS4 will sell 25 million units before 31st of March!
Edit: I didn't state what year! HAHA, so I'm still right in some sense