A new advertisement has cropped up on the Blizzard site for an "unannounced project" that in and of itself seems like nothing too exciting. However, the addition of "A passion for games with a deep understanding of the Diablo franchise" is the clue. Whether this is an expansion to Diablo III or if it’s an entirely new entry into the series, Diablo IV, remains to be seen, though Blizzcon could see a big announcement for fans of the legendary IP.