I've got a Biz Rewards Gold AMEX and I got an offer in my email to upgrade to the biz Platinum card. Its not worth it for me but I'm curious if anyone knows the difference in how AMEX views "upgrading" vs "applying" for a new card. Im mostly asking because I have been thinking about getting the Mercedes Platinum Amex but I don't really want to cancel my "normal" Platinum Amex. A few questions: - Are you typically eligible for new bonuses when upgrading? - For platinum, would I get the $200 credit again this year? - Is an upgrade a continuation of an existing credit line or the establishing of a new one? - Is there a credit pull?