Andy Rubin, the founder of Android (the company) and head of Android (the mobile software division at Google) is not leaving Google.
And, simultaneously but unrelated, Android device activations are now running at more than 900,000 per day, according to the latest tweet from Rubin. Based on previously given figures (850,000 activations per day, and 300m devices activated, from the Google Mobile blog in February) that suggests that there have been a total of 390m Android devices activated in total. (It’s impossible to know how many of those are in use, but as the majority have been activated in the past two years, it’s a good guess that it’s a very high percentage of that total.)