I got an email from Hilton, telling me their database was managed by Epsilon and may have been compromised by this breach. That's the only email I've had about it. I haven't noticed an upswing in spam, at least not yet. Fingers crossed I got lucky.
Funny thing is, I haven't even stayed in one of their mediocre hotels for years, but I guess my email is still on their HHonors database. I wonder if I have any points left after this time; IIRC they got removed after a year or so, so I'm surprised my account hasn't been wiped. Probably been busted all the way back down to Blue instead.
As long as only email addresses have been accessed, I can't say I'm too bothered.