I never mentioned anything about professionalism. And after the third time, it's more about courtesy than anything else. As crazy as it seems, you have created a game that hundreds of people are anxiously awaiting. I'm sure this is what you and the developement staff wanted all along; a growing player base, am i right? People are actually altering thier schedules in order to play this game (much like going to the midnight premier for larger games). I am a developer myself (everybody says this, just bare with me) trust me, i can relate to "unforeseen circumstances". But if you're finding that you aren't as ready as you thought you were, please push the early release back to a date when you, undoubtedly will be ready.
At the end of the day it comes down to responsibility. Writing a few words on the top of the page will cause hundreds of people to stare at thier computer screen for hours.
Sorry if i came off ranting, i really appreciate what you guys are doing here though. Watch out for the copyright monster it's the pitfall of great projects like this one.