As far as I'm aware, top 100 rankings will remain separate (same as it is for IOS and Android). And regarding launches if you start your launch, only those who are on your friend list can join.It may sound good on paper.
You think it's hard now to win a space launch with someone like S.B. on your neighbor list. Imagine dozens like him coming in from Android or iPhone.
Same goes with the weekly Top 100 ranking. Forget about getinng one of the top spots.
And I'm not even talking about all those cheaters especially on Android.