What’s going to take off this year? Fidelity's 401(k) team put together a list of trends it believes will gain a lot of traction in the coming months, including higher adoption of Roth 401(k) and managed account options.

1. Self-directed brokerage windows. To give participants more investment choices, employers are offering self-directed brokerage options that allow them to invest in options outside of the company’s fund lineup. Brokerage windows continue to gain in popularity, with about 26 percent more assets in 2013 than in 2012, Fidelity found. It also found that there were 18 percent more participants using brokerage windows in 2013 than in 2012.

2. Roth 401(k)s. Employers continue to add Roth 401(k) features to their plans as a way to help participants manage the uncertainty of tax rates in the future. According to Fidelity, as of Sept. 30, 2013, about 42 percent of 401(k) plans offered a Roth 401(k) savings option, up from 21 percent in 2009. As more employers add a Roth option, participation adoption and utilization will continue to increase.