I just canceled my order at B&H (Mar 1, 2012 at 10:06 PM PST) in order to order the bundle at ADORAMA, the free SD from Sandisk and the other goodies changed my mind.
I am really impatient but the free stuff made a difference.
I had a chat with a B&H rep and he told me that B&H may also offer bundles when the 5D3 will be in stock but no guarantee.
However, I would disagree with Astrogarden on B&H. All B&H representatives I had to deal with were courteous and helpful (even the guy I had on the phone to cancel my order, they do not cancel orders through the chat).
B&H has a really good customer service when you have issues (I had to exchange lenses several times).
It is true that they do not provide a lot of info on the 5D3 availability but neither does Amazon nor Adorama (where I just ordered the bundle).
It is hard to be patient, especially after such a long wait since the 5D2 release. Nevertheless, I will continue doing business with B&H.
I hope that I will receive my bundle soon. If not, I will continue using my 7D while waiting. I am optimistic though since it seems that there will be plenty of stock in the upcoming weeks.
Maybe it is the same as at Gamestop where they "insist" for you to preorder a game but I never had any issue to have one without preorder (even Skyrim or other big hits).