According to the website for the Catholic Biblical Association, the NAB is set to be published later this year. The site states: "January 2010: The revised NAB is set to be published by mid-2010. [Wikipedia.]"
That is great news! I was hoping for the end of the year, but mid-2010 is just fine with me. Although I am curious as to why the CBA website quotes from Wikipedia? After a bit of web surfing, the citation on wikipedia is taken from the USCCB website for the NAB. It states that: "A revision of the translation of the Old Testament, excluding the Psalter, is currently underway and should be published in mid 2010." I am not sure why it says "excluding the Psalter", since the CBA site says that the NAB Psalms were being re-revised. That could simply be an oversight, since early on the revision wasn't going to include the Psalms. But who knows at this point.
Update: The USCCB site has been updated, as Mary Elizabeth Sperry said it would, to read: "A revision of the translation of the Old Testament, including the Psalter, is currently underway. No publication date has been set. "