Yes, I totally agree to that. Main reason for the announcements was the fact, that people explicitly asked for it in the past. Especially server admins (I can understand that) wanted to be aware of an upcoming update, so they can make sure that they're able to update their server in time. On the other hand, it's always a pity if the update gets delayed then...
Hmm as far as I recall, the previous announcements were - at least more or less - appropriate. The last update announcement, for example, was pretty much identical to this one, with the exception, that the update was available at 7 pm GMT indeed. However, I guess it is no secret that some updates have been delayed in the past, so it's indeed better to reduce the amount of update-announcements
Such is life in developer land. I have a long time friend that wrote doom and so many other titles for the pc (Apogee Software ) I loved his release dates. They were always the same . "When it is ready " he never gave a date
I am actually writing a game myself (for android and tablets in unity ) and I don't know if it will ever be ready LOL