This is merely a phishing email. NO DOT RESPOND TO IT. Your email address was leaked earlier, people are playing with you.
DO NOT FOLLOW ANY DIRECTIONS IN THE EMAIL.
You had me going for a second there..but no, this email arrived to the NEW address that I added AFTER the claim/reset page.
So either that got leaked, or it was indeed a password reset attempt.
It'd be nice if they'd put announcements on MtGox notifying users of this sort of thing.