My objection to the release date problem isn't that they're moving the date. I agree, a quality release later is better then a poor release now.
But the difference between Starcraft 2 and Entrenchment is that Starcraft 2 never had a date. Entrenchment has had several, and they were all wrong. I mean right now "next week" is showing up on the front page of this site, and that's probably wrong too.
That's the motivation for my suggestion above to have "unknown" as a valid date in Impulse. If they don't know when it's coming out, just be honest about it. Gamers are forgiving. If it's good, we'll wait. But people who buy expecting a final release next week (or in November) and then don't get it for who knows how long tend to be more negative about it.
(Maybe a quarter estimate would be okay. "Release date: Q1 2009" gives an indication of how far along it is, but is also vague enough that people shouldn't mistake it for a fixed date.)