Travelled while H1B was processed

The situation is that I went to India while my H1B was under process. So my H1B application contains my old I 94. My H1B application was submitted with a Change Of Status. My application was picked in the lottery while i was in India and approved after I returned to US on my current H4 visa.

In this situation will my visa status change from H4 to H1B on Oct 1st 2015?
If no then will I have to submit a new Change of Status request when I want to start working?
Will there be any issue with my H1B in this case?