ABLE accounts were authorized by federal law by adding §529A to the Internal Revenue Code in December of 2014. They are actually allowed to be operative by 1-1-15. However, they are not yet in effect in CT (effective 10-1-15) and you can't set one up.
Connecticut passed the legislation and it was signed into law (Public Act 15-80) on 6-19-15, however it is not effective until 10-1-15.
So, if you live in CT, regardless of whether it is Wilton or Easton, until October, your only option is a special needs trust which is more complex and expensive.