Earlier `jython.bat` and `jython` shell script were directly under Jython installation directory as well as in `<INSTALL>`/bin`. Nowadays (tested with 2.7rc3) the are only in the latter.
This can cause problem for users upgrading from 2.5 or earlier preview releases. For example, I just had `JYTHON_HOME`in `PATH` but that doesn't work anymore. This is also inconsistent with how CPython and IronPython installers handle python.exe/ipy.exe.