While I am sad about the release date being pushed back, if Tripwire feels it's needed, then it's needed. I'll not fault a developer for refusing to put out an unfinished product, and I respect developers who stick with that standard.
That said, a timely announcement of the Beta date would erase all sadness, especially if the beta is within this week. I would in fact be severely disappointed if the majority of the players who bought the Deluxe edition for the Beta, were not able to play said beta until the 30th because of the delay.
I wouldn't even have a problem if the Beta is delayed, except for the fact that many people paid specifically for the opportunity to 'test' (Play) the game earlier than they normally would have, despite it's unpolished state.
So, I don't mind the delayed release date, take your time Tripwire. However I just hope the Beta is not delayed for this reasoning.