NEW DISCLOSURES: It should get easier to assess how much 401(k) participants are paying to invest. By Aug. 30, most investors can expect to get new 401(k) fee disclosures from their employers as a result of new federal regulations.

WHAT THEY'LL SHOW: Expenses charged by each mutual funds included among a plan's investment options, along with fees charged to administer the plan.

WHAT THEY WON'T SHOW: Employers aren't required to provide a single-number summary of how much an investor is paying overall. And don't expect comparisons with average fees at other plans or some other benchmark.