Hi dreamscape,
I don't think the increasing indexed pages is affecting your website traffic.
The more indexed pages you have, the more keywords your website will have and the result is the more traffic you will get from that.
Just check your GA to see if it's installed correctly.
At...
There's nothing new to me, even I logged into my account already. But I have heard a lot of news about these changes but don't when Google will officially launch it out.