So, back during that Comic Con panel, it sounds like Season 3 actually did get a loose release date while the crowd was cheering at the end. Amazingly enough it took until today, 5 days later, for someone (Zach) to point it out to us! I blame the bad sound quality in the clip I uploaded! In the video below, as well as all recordings of the season 3 song portion of the panel, you can clearly Micheal Vogel (VP of Development for Hasbro Studios) say "Tune in next month!"
We still don't have a set in stone date, and he could have just been excited at the entire room exploding in applause, but It's the best we got so far!