A lot of changes have been done and all round up in the new package 0.8.
Major changes: - Cython support - Unification of Sparse GP code - Prediction improvements - Test Coverage - Python 3 support
0.6.0
After a year of development, many improvements in GPy are now available. Checkout the website for new tutorials, documentation, and a changelog. http://sheffieldml.github.io/GPy/