Used GCM over the weekend before news broke that the website has been compromised.
Locked my card yesterday. Today, I have multiple large thousand dollar fraud charges attempted even though my card was locked. It appears only 1 out of 3 fraudulent charges triggered a fraud alert so this a very sophisticated fraud operation going on.
Anyone that's used GCM in the last month needs to lock their cards ASAP. I think most issuers have this feature. If not, I would preemptively just have card number reissued to save time & frustration in dealing with this.