Current PRG owner. Have new EveryDay Preferred. Applied using incognito browser.
I sent a SM (well, I "left a message", since no one was available for live chat) to confirm my signup bonus/spend requirement and received the following response:
Thank you for writing in.
Welcome bonus offer linked to Amex EveryDay Card is to earn 10,000 Membership Rewards points after one uses the new Card to make $1,000 in purchases within the first 3 months.
However, this welcome bonus is only applicable for new applicants. As you currently have an American Express Card account, you may not be eligible for this welcome bonus offer.
Of course this is the wrong offer (it's for the non-preferred)... we'll see what happens.