H1B visa extension question, need to travel out of country

I need suggestions to deal with my situation. My current h1b visa expires on 30 September 2013. I will be applying for an extension in the first/second week of June with the same employer. I need to travel out of the USA to India for 2 weeks in the month of August (travel on 10 August and return to USA on 23 August). I am thinking of applying for a premium processing during second week of June. Although my visa expires on 30 September, is it possible that I will get my extension approved before August so that I can travel without any issues? If there are any other options I need to look to have my visa extended and also do the my travel without immigration issues please suggest. Thanks for your help In advance.