Dream Theater is only one of many artists affiliated with RoadRunner. If RR say an announcement is forthcoming, then it may be from any one of their artists. If someone asks if it's going to be Dream Theater, everybody knows that they can't answer that with a "Yes" or "No"; the only proper response is "Maybe". It's a perfectly acceptable and correct answer; the only other option would be not to respond at all, which is lame.
Every possible variation of "Maybe" ("You'll just have to wait and see", "We can't say", etc.) would have been met with the same response: "Oh God, I knew it! It's going to be about DT!" People will read what they want into the reply.
Are they not allowed to post announcements from any other band, just because DT is in the studio and a handful of rabid fans will go apeshit if they don't get a daily dose of inside information? Is every announcement regarding any of their other bands going to be met with "Fuck you, I thought this would be about DT!"?
Seriously, what were they supposed to say when asked?