Hi,
Can we get verification of this? I received a message from Sergey on the 29th asking me to test the plugin - which worked!! I assumed the issue had been resolved and was waiting for an announcement here.
Cheers,
Craig
Appears to be the case.
https://android-developers.googleblog.com/2017/04/focusing-our-google-play-games-services.html
https://android-developers.googleblog.com/2016/12/games-authentication-adopting-google.html
Time to do some gamecenter coding 
Craig
Hey everyone. This is pretty straight forward. Google is not going to include iOS in its next SDK release. They historically force you to new SDK’s, though not as aggressively as Apple does. Google has been very clear that very few people are using this and it’s not worth their engineering time to continue.
This leaves us with two situations: 1. People have already chosen to implement GPGS for iOS. 2. People may want to do this in the future. We strongly discourage any new apps from going this route. We have no idea when Google will force us to use a version of GPGS that won’t have iOS support. If you’ve already implemented GPGS for iOS it’s up to you to determine if you’re too far committed to it in your deployment to continue to use it or explore other alternatives.
For those who have already implemented it, we know there are a few bugs that need addressed. We will address those, which is why you’re seeming to get conflicting information.
The long term answer is quite clear from Google. GPGS for iOS is no longer going to be developed.
Rob