Booked visa appointment while H1 B extension was under process

Hi All,

I am going to india for 3 weeks and hence I booked visa appointment with present petition details which is valid from July 2013 to Dec 2013. Mean while my employer processed H1 B extension and new petition is valid from Jan 2015 to May 2015.

DS 160 refers to petition which is valid till december 2013. Do I need to fill a new DS 160 with new petition details and update the visa appointment? Can I just update the visa appointment or do I need to reschedule the appointment. Request you to answer soon.