Andy Rubin reminds us he is an 'entrepreneur at heart' in a letter to Android partners

In a letter obtained by the Wall Street Journal, Andy Rubin takes some time to talk to Android partners about the growth of Android, and why he feels it is the right time to step away and leave things in the capable hands of Sundar Pichai.  Tucked in amongst the praise for the Android team and and remarks about Android's astonishing growth, Rubin lets everyone know he has always been "an entrepreneur at heart" and is ready to start a new chapter at Google.  We've no idea what that new c...