They changed both of my BofA, former MBNA, cards last month.
One was a Business Platinum card that never reported at all on my CR. Still doesn't show, of course.
The other concerned me that it would change my utilization since I knew from this forum that a "Signature" card would probably not report the limit. This concerned me more since the limit on that card is $46,000. I called but they said there I had no choice on the change. My only other option would have been to close the account.
They changed the card number on this account so that made changes to my reports, one even showing both the old number and the new one as being closed. Now that things have stabilized I see that 2 of the 3 CRA now don't report a limit. One still shows the old limit. This hasn't seemed to change my score at all but my recent high credit was $41,000.