If you want to follow the development of PyTables and take part in it, you may have a look at the PyTables project pages on GitHub.
The source code for PyTables may be found at the GitHub project site. You can get a copy of the latest version of the source code (under development) from the master branch of the project repository using git:
git clone firstname.lastname@example.org:PyTables/PyTables.git
Other resources for developers: