Look for Austin to have a rapid increase in growth once the 2014 numbers come in next year. We need to remember that what we are experiencing right now is not included with the latest statistics.
Another interesting indicator is number of jobs. Take a look at this graphic from the census.
Despite the difference in population Austin and San Antonio are pretty equal when it comes to jobs. Not only that but Austin is clearly adding more jobs and by the rate of growth, we may pass San Antonio by the end of the year.