Youth champs has been a limited entry, application only event for many years now. The difference this year is US Sailing is using youth champs as the Youth Multihull Championship, which is a great change.
It also appears that US Sailing is modifying the selection process for the 2014 youth worlds team. For 2013, the selection was based on a single regatta qualifier (in Sarasota last month). For 2014 it appears that the selection process will be application based, but I can't find it anywhere.