We have just officially released the 5th update for OOTP 15, version number 15.5.25. It is a maintenance release which fixes reported problems and also improves the 3D mode (the PC version now supports anti-aliasing, for example) and Facegen on the Mac.

Here are the improvements / fixes compared to version 15.4:
- Fixed bug which prevented AI teams from offering arbitration to FA eligible players
- Improved Facegen on Mac
- Improved 3D ballflight, including anti-aliasing support on the PC
- Improved trading AI
- Improved play-by-play commentary
- Improved in-game AI in numerous situations
- Fixed several bugs and cosmetic issues

This update should be the last one this summer. We'll probably have another one during the fall which will fix problems that get reported in the meantime.