This release marks the transition of drupal.org to Git.
Very little has changed in code since alpha2, the instructions themselves however have changed.
Mostly thanks to eliza411, halstead and others who looked at this during the community testing period.
Issues:
#1053362 by halstead, eliza411: Changed Refresh directions to match git-dev.drupal.org.
#1061802 by halstead | webchick: Fixed Capitalize 'git' in account settings missing string.
#1054466 by helmo, halstead | eliza411: Added Conditional messages if git-username is not set.