If you see unexplained or fraudulent activity in your account, it's natural to reach for an explanation and natural to attribute it (correctly or incorrectly) to the
PSN data breach.
OTOH, a good security mindset should probably assume that the attackers will use the ill-gotten data in some malevolent way, not just for lulz.
Make no mistake, I am concerned. I'm monitoring my account, and if Sony confirms they were stolen, I'm probably going to get a new card. (Which will be an enormous pain in the ass, but I also recently moved, so I can easily recall what recurring billing my card is tied to.)
OTOH, a good security mindset should probably assume that the attackers will use the ill-gotten data in some malevolent way, not just for lulz.