It's still going to be a scam message, but they can use your Facebook ID to see everything public on your profile now, as well as the other fields in the leak like full name, location, bio, birthday. So whatever the most convincing scam message somebody can come up with is combining all of that data. Off the top of my head, "happy birthday here's a gift from us" messages from companies leading to phishing pages and personalised fake register to vote pages relating to upcoming elections in your area.

It's not really new data, it's just scam SMS I've received in the past has never shown any sign of knowing anything other than my phone number. Now you can buy phone numbers and pull personalisation data unrestricted from your copy of Facebook's database for each of them. I'm sure sophisticated scammers already were, but now everyone will.