For now, it's just a "lightweight signal that will affect "fewer than 1% of global queries and carrying less weight than other signals such as high-quality content." But that could change over time as Google strives to "encourage all website owners to switch from HTTP to HTTPS to keep everyone safe on the web."
http://www.forbes.com/sites/larrymagid/2014/08/07/google-to-reward-sites-with-http-security-in-search-rankings/
From My iPhone