I read my letter from Costco (received today) a couple of hours ago. I read the whole thing, front and back (the FAQ). I wasn't upset. I like Costco, I'll roll with it. It's weird that they said that a lot of factors are up in the air and yet to be determined but I'm not worried. I have never dealt with Citi but got a letter from them a couple of weeks ago promoting their Double Cash CC, and I immediately applied for it and have it now and I'll be using it alot. It will replace my CapitalOne Quicksilver card, which has 1.5% cash back on everything. Am I worried about Citi? What's the deal? People here have touted the Double Cash back Citi card quite a bit, I haven't previously heard about issues dealing with Citi CCs. Now, my Citi Double Cash CC is Mastercard and Costco says the new card they will automatically issue in tandem with Citi is a Visa.