You can now choose a kernel for a notebook within the user interface, rather than starting up a separate notebook server for each kernel you want to use. The syntax highlighting adapts to match the language you're working in.
Information about the kernel is stored in the notebook file, so when you open a notebook, it will automatically start the correct kernel.
It is also easier to use the Qt console and the terminal console with other kernels, using the --kernel flag:
ipython qtconsole --kernel bash ipython console --kernel bash # To list available kernels ipython kernelspec list
Kernel authors should see :ref:`kernelspecs` for how to register their kernels with IPython so that these mechanisms work.