I can't imagine the DC family being kept up to date. When you buy the rights or license to a "product" or entity, the only reason any representative of said license holder would be kept updated is in relation to the completion of the project for which the license was purchased. Maybe occasionally an update about where the project is if an inquiry is made.
Even if we were to assume Jim Pierson knows where the project is at this stage, there are a multitude of reasons why he cannot share information on an ongoing basis. There's no reason to be secretive for the heck of it. Afterall, it's just a movie and not a plot to overthrow a government.
It's normal rather an abnormal to keep information about an ongoing project to a minimum until the last minute. TV series do this all the time.
nancy