I am in the same situation as you Jenny. I contacted Bear Vault. (A copy of their email is below)
I noticed that REI now has the latest Bear Vault model. I am going to exchange the one I bought last year. However, I have yet to see that the park service has officially appeoved the new model.
----- Original Message -----
From: bearvault
Sent: Sunday, May 14, 2006 4:11 PM
Subject: RE: Quick Question
Well you can do either of the following:
When you get your permit for the Rae Lakes area, we are working on a swap program with the permitting stations in this area so that if you have an earlier model you can just swap it out for the new one when you pick up your permit. We will make an announcement when we get this program sorted out later this month.
Or, you could swap your unit out with the retailer you bought it at
Or if you are not going to Rae Lakes then continue to use your current model.
Does this answer your questions?
Jamie
Mike O