In short: 2K reports that one of the vendors for their support was breached. The hackers sent out emails to people who had interactions with the 2K support, with a malicious link in it (or trojan attachment, depending on source). If you recently received an email from 2K which you did not expect and you clicked a link in it/downloaded an attachment, then you might be in trouble, and should do the general security precautions like changing your passwords.
For discussions about this please see here.