As per title, I don't get why did Sencha choose ant as build tool in the latest Sencha Cmd tool. Ant is Java-based and requires xml config files, while using grunt http://gruntjs.com/, which is Javascript based and would use JSON config files, resulting more consistent with the other app configuration files.
Moreover, you Sencha guys are JS geniuses: you could exploit that building environment at its top!
Wouldn't it be nice for the next build tool releases?

Vito