Agree with KB (as usual)
Sigh... Marketing...
I would conduct research on the demographics of the new AA. If the new AA is a higher percentage LMI, or has a higher percentage of minority residents, you should definitely bring this to management's attention. We just went through an exam and the examiners thoroughly, and I mean thoroughly, reviewed our marketing plans and any direct mail campaigns. If they find out your advertising lending in one area and excluding LMI/high minority areas you could be in a world of hurt.
And like KB said, why on earth wouldn't they want to expand their presence and build brand recognition in the new AA? Seems like good old fashioned business sense to me.
Best of Luck!