This looks like an A/B test, I just talked on FB with Robert Cezar Matei. He got this when trying to open a Gmail account (not GWallet), but when I tried I didn't so, like I said, maybe an A/B test.
You can also click the "not now" to opt out, in the test. When I first read this, I read it as Google requiring you to enter CC info to get an account.. not the case.