H1B and H4 renewal with already existing extension

[raviteja67]

Hi :
I am going to India on 06/10/2016 and coming back to US on 07/17/2016. I have valid Visa until 09/17/2016 and I797 extension up to 05/10/2017.
Do I still need to go for Visa interview in India? If I did not go for visa interview , does I get new I94 on arrival to me and my wife up to 05/10/2017.
My wife does not have extension. She has only valid visa until 09/17/2016 .



Thanks for your help.