According to Fidelity, which is the top 401(k) provider in the country, more people are putting all of their retirement savings in target-date mutual funds. Those funds allow investors to select a target date at which they will retire. Analysts worry that people are still taking on too much risk, and that the funds are not as safe as they think.
See "More U.S. workers put 401(k) investments on autopilot", Tim McLaughlin, Reuters, February 8, 2012