The email references a Google Plus settlement and directs the user to www.googleplusdatalitigation.com to redeem a settlement claim. The website refuses all connections at the time of writing.
All people I've talked to so far are highly skeptical of this email. The lawsuit does in fact exist. The purported settlement administration website is hosted on Amazon Web Services and shields its whois information using Amazon's product. I can't really tell more beyond that.
Can anyone advise as to whether or not this is a legitimate thing?