I preordered with an old card and I have a new card now. The old one is deactivated. I had checked out as a guest and if you try to manage your order it wants the previous card...which is deactivated so I'm assuming as a guest I'd have to rebuy the expansion.

I have Early Access registered so I dunno how it'll go down. But rebuying the xpac isn't a big deal to me so we'll see.