Yes. Ubisoft was hacked (
Joytiq article).
If you've received such an email, change all passwords related to ubisoft(Forums, UPlay). If you use the same password across multiple sites, change it as well, and use a unique password.
If you're using simple/non-unique passwords, I recommend using
KeePass to make and keep track of complex, unique passwords.
I wouldn't rule out some spammer using this for spearphishing, so using the site itself rather than a link in the emails is a good idea.