A partnership between the Society of Actuaries and the Kaiser Family Foundation will tackle the key drivers of health care spending.

One proposed rule: Web brokers can't list issuers that pay more first.

"While the 401(k) market will continue to evolve ... it is now a mature segment,” Cerulli director Jessica Sclafani said.

As more industries and employers place greater emphasis on worker well-being, finding creative ways to engage employees is key.