Every Z2 feature is ported to the Z1 by the active community. I am 99.9% sure that this feature will get a port for the Z2. They have beside a slight upgrade for the camera the exact same hardware. 

I can use use any numbers to back up these 90%... nobody knows what these 90% are based... if it is based in new subscriptions or active users.

Another data...

- As of January 2012, Music Unlimited has over 1 million active users.

I serious doubt the Music Unlimited have more than 5 milliuon users today... the Video Unlimited have way less too... most of these 53 million are Plus subscriptions.

2 million Plus users before PS4 launch is unlikely.

As a few people have pointed out, it's up because it is required for online play, regardless of the value PS+ does bring . Still, let's hope that money goes to creating a better and more reliable online experience, it's the least they can do.

53 milion service users

At least 5 million PS4 psplus

At least 5 million on both Video and Music???

At least 5 million Playmemories (Sony sells around 13-14 million cameras a year and that service is also available on mobile)

38 million psplus users on PS3? Seems too high to me but it is not unlikely. Somehow I think PlayMemories has a lot more users than everyone would assume. Maybe there are a few other services accounted in that number like PsNow beta and some other services in Japan?

Yes. PS+ before PS4 was at around 1.5 m. 

Huh. There were like 1-3m Plusers on PS3

...thats not remotely true at all..theres a reason why it was announced that after PS4 came out, Gamestop sold 3 times as much subscriptions than the whole lifetime of PS+ on PS3

I have been very happy with PS+ and never used it to game online. Sales and game trials alone make it worth it to me.