With earlier releases, release dates were given - IIRC, I have absolutely no statistics ready - up to one week before the episode's release. That, however, was at a time before Telltale sold big in consoles. The console certification process is what makes the release date extremely hard to determine for TTG, so you should rather expect this to be a short notice again.
Moderators on the TTG forums are all volunteers from the community and still belong to the community. They are not employees of the company. The opinions expressed in their posts are those of individual fans and must not be confused with official company statements.