THEY like to be the ones to announce stuff -- not have others blab, and then when the official studio announcement comes along, it gets a big yawn from fandom of, "Yeah, we knew that for weeks already. What ELSE ya got for us?", and it's almost like an egg-on-their-face moment for 'em. In fact, if somebody blabs about something TOO far in advance, and no work has yet been done preparing an oldie for release, there are companies that'll happily say, "Okay, we WON'T release this oldie now, we'll release some OTHER oldie instead, to make the blabber look unreliable."