This question would probably be better answered on the TGM forums where they are more familiar with his 'typical and usual' patterns for releasing touring advice.
From my own experience as a member there, I know that he bases his information on Disney's park hours, and he seems to get them out shortly after Disney releases their hours. Though for more specific information you probably want to ask there.
Since TGM is pretty specific in his Terms of Service that he does not want his touring information discussed outside of his forums, we are going to close this thread here. Thanks for understanding!