Seems really sketchy, absolutely not from CoinBase.
What annoys me is how did these scammers get access to CoinBase's users' emails (CoinBase's fault?).
Following is from Coinbase online chat. Cannot believe how nonchalant they are about this whole incident!
"Now Chatting
Seth: Hi there! What can I help you with today?
→Got your News message about the investment product. Please supply more information, such as a Prospectus.
Seth: That appears to be a scam email. It's not from us.
→So how did they get my username and your domain?
Seth: That is beyond my technical understanding, I'm afraid.
→Good god, man!! Your site got hacked and that's the best you can say!!
→Wait til I blog that moronic response!
Seth: I do not believe our site has been hacked. But feel free to do what you want. Have a nice day!"