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I have 2 questions, 1 somewhat signifigant, the other, not so much.

Important one: Can the beta weekend friend's pass be used after launch?

Not so important: Do you think the game version will be called 1.0?

1) No, the friends pass is only good for beta weekends Here
2) No, There has been a few builds of the game as of right now i think we've gone though aboout 8 versions

I don't really think its 8 versions, the build number you see is actually the total number of builds that the game as gone through. So there have been over 8 or 9 thousand builds so far. New builds happen frequently in the Beta, sometimes even within minutes of each other. We always have to restart the game when a new build comes along, but its a good system since they can easily and quickly make changes and fixes to the game.

No clue if they plan to keep the build number system after release.

Your right I just mean that I don't think they'll call it 1.0, more like 1.X, version 1.0 is used for the first one, we're past that.