The fusion projects have been running for a long time with little success. Apollo was built on scaling tech that already worked (1940s rocketry could reach space although not achieve orbit)
NASA is currently working with John Slough's company on a fusion rocket for interplanetary travel.
http://www.nasa.gov/directorates/spacetech/niac/2012_phaseII...
http://www.washington.edu/news/2013/04/04/rocket-powered-by-...