Can we please find out how long the user of the new MacBook can look forward to using it between battery recharges.

I.E what would be an expected battery life. The data is missing from the official specs, and It would be nice to know without having to wait for the official reviews.

As a business user, Speed increase is nice, But battery life is Vital. Will we again see the 4-6 hours of my old titanium powerbook, or my Wifes Ibook ?