PyCharm 2.6 release is planned for September 3rd and will be a free update for everyone with their license purchased after Sep 4, 2011. [1]
So, hold on the PyCharm 2.5 purchase at $59[2] till tomorrow other wise, you will need to pay for the 2.6 upgrade too!
[1]: http://www.jetbrains.com/pycharm/nextversion/index.html
[2]: http://www.jetbrains.com/pycharm/buy/index.jsp?BacktoSchool