Google disabled this very quickly so most likely no one has been affected, however if you DO have a user that entered their info before Google took it down, just have them reset their password. The Help Desk can assist (x4357).
Affected in what way:
A new phish has hit a number of users on campus with a subject of "UPGRADE YOUR WEB MAIL ACCOUNT" and body of "You have exceeded your quota limit of 500MB e-mail and you need to expand the share of e-mail before the next 48 hours. If you have not updated your e-mail in 2013, you should do it now. You can expand the share limit of 10GB email" and below that a link. Google has disabled it so this systat is mostly just informational.