At the present time the final draft regulations for the Personal Independence Payment (PIP) have not been confirmed, so it is impossible to speculate as to what may happen following its induction in April 2013, particularly with claimants over the state pension retirement age?
As it stands, because your husband will reach the SP retirement age in February 2013, he will be required to claim Attendance Allowance in April 2013.
Nothing on this board constitutes legal advice - always consult a professional about specific problems