I didn't want to put a question mark on that for the traditional reasons. However it seems this might be true. At last.
Thanks to Henry Ho for putting this news in front of me:
#coldfusion stopped supporting UI tags. RT @udayogra: As decided we won't invest any time in Ajax UI components https://t.co/kWD7vIbddO
— Henry Ho (@henrylearn2rock) June 30, 2014