Asterix,
By the official decision release date, you will have known whether or not you are accepted. However, there is no way of which I am aware to have this result expedited for many reasons (e.g. - ensuring AdCom has sufficient time to review all necessary considerations). This is also done to promote fairness amongst all applicants. It would also be to your benefit (most likely) to have AdCom give the most thorough review and consideration of your application materials. A hasty response by AdCom could, at worst, result in a premature rejection. A theoretical, premature acceptance could also end up negatively impacting both you and Wharton if the two are not the best fit.
I can appreciate the challenging position in which you may find yourself, but this will be the first of many significant decisions you will make in your career for which there is uncertainty and lacking information. This, in a way, is good practice. I would suggest that, if it is feasible for you to do so, you lay out your options clearly to your employer so they understand the circumstances facing you. If explained well and with care, many employers will understand and appreciate your candor and initiative.
Good luck,
Victor M. Lee
MBA Candidate, Class of 2011