"At Google, we are keenly aware of the trust you place in us and our responsibility to keep your privacy and data secure. As part of this responsibility, we let you know what information we collect when you use our products and services, why we collect it, and how we use it to improve your experience. The Google privacy policy & principles describes how we treat personal information when you use Google's products and services, including Google Analytics."

http://www.google.com/analytics/learn/privacy.html

There's simply no evidence that increased data sharing across Google involves linking Google Analytics data to individual personal accounts on Google+.

(If anything, the trend at Google is towards less integration between GA and Google Accounts; for example, Google now prevents Google search terms for logged-in Google Accounts users from getting passed in the referrer for search traffic.)

But if you buy Google Ads you still get that information. That speaks volumes.