After reading this thread, thought I'd give it a 2nd go on upgrading my sock-drawered Platinum Mastercard to the Quicksilver Card via chat- here was my result:
Apparently you can convert now! As per the chat representative, I'm getting upgraded to the no-AF, Quicksilver 1.5% cash back card, with the same account number I've always had. I assume it's not Visa Signature because the limit was 1.25k before- however, I'm kinda stumped because the Mastercard version is the one with the AF. But we'll see what happens. APR should be lowered as well (even though I have never carried a balance, nor intend to).
I tried to convert this into a Quicksilver about 5 months back via chat as well, and was told I could NOT do this, but again you apparently can at this point. Anyone else going for it? Never hurts to ask!
Although it's still probably going to be sock-drawered for me, Cap1 seems to be more and more generous in their products this year over previous years that I've seen.