I also never received an email or any splash screen. I only found out today when I logged into my Paypal to check my balance & noticed the double-charge.
To be honest I don't see how many, if any, could be confused by the old billing method. Especially since that's the way eBay bills you. Although, i'm sure they'd bill ahead if they could.
I really used to enjoy selling things on eBay years ago, but anymore it sucks!