Would like to mention here that upon confirmation of the offer, your new card setup will be initiated. There is little to worry about as there would not be any hard enquiry with your respective bureaus and there would not be any significant impact on your credit health. Kudos!
In case you do not wish to go ahead with this process, your existing card will be closed within the next 45 days. This window is provided for any refunds or dispute credits on the existing card.