In December, the ABLE Act was passed. It allows for families to save up to $100,000 in a special account that will not affect Social Security (Supplemental Security Income) benefits. These accounts will take about a year to get up and running. Each state is responsible for setting up their own program.
Read these articles for more detailed information:
Autism Speaks - 10 Things to Know about ABLE Account
Saving for College - The ABLE Act and What it Means
Investment News: Meet the ABLE Account