I myself havent heard anything directly but i figured id double check.
some second hand info been running about places in colorado been instituting reequired helmets. Does anyone in Summit county require me to wear a helmet to ride this season
What you heard probably is about Vail Resorts employees and mandatory helmets.
Vail Newsroom: Vail Resorts Makes Helmets Mandatory for Employees in 2009-2010 Winter Season