While many people thought Disney/ABC/ESPN, et all were the front-runners to pick up the Olympics from NBC, that turned out not to be the case. NBC has secured the rights for the 2014 & 2018 Winter and 2016 & 2020 Summer Olympic games. NBC’s current deal runs them through the 2012 Summer Games in London.
NBC has also confirmed that they will commit to showing all events live either on TV or online. I assume NBC will also use their affiliates (like they have the last few Olympics) to also assist in live broadcasts of events.
As screwy as NBC has been with their broadcast TV over the last several years, this is the one thing they do amazingly well year after year. I love their coverage of the Olympics so I am thrilled they will continue through 2020.