The FRB never issued a press release indicating that they made this 8/2009 update to the CHARM booklet. In the past, when substantive changes were made to the booklet they would issue a press release announcing the new version of the booklet and they would tell you that you could exhaust your existing supply and then order the new booklet.
Keep in mind that the 8/26/09 Reg. Z proposed rule for closed-end credit is proposing to eliminate the CHARM booklet altogether and replace it with a one page disclosure that discusses fixed versus variable rate loans. If you have enough of your 2006 booklets, I would continue to use them.
Opinions expressed are my own and not necessarily those of my employer. They are not legal advice.