Sambhav’s GSoC project is all about Picard 2.0, and among progress made the devel version is now installable via PyPi: https://pypi.python.org/pypi/picard_dev
To install the dev builds you need to have a Python 3.5 or greater. At the moment it is mainly a port of 1.4.x to Python 3 and Qt5, with support for HiDPI and new icons !
Please note that Picard Dev version uses a different config file than your stable Picard installation. As such the settings and plugins will be on their default configuration.
To use your stable config with the dev version, simple copy your “Picard.ini” file from your MusicBrainz user folder to “Picard Dev.ini” which can be found in the same folder.
Since testers may want to run a stable 1.4.x version along the 2.0 dev one, the executable is named “picard_dev”.
Of course, we encourage people to test this version on every platform they can, and report any issue.
Thanks to Sambhav Kothari for the fantastic job he did on this ! And stay tuned, more to come !
MetaBrainz Blog 
Please note that even after copying the config file (and even the plugins folder), there will be *no* warning in the UI that plugins incompatible with Picard 2.0 are disabled, except for one small log message. If you rely on plugins for anything, please test only on a small subset of files and not your whole library.
To install PIcard Dev on Windows 10, I had to first do the following:
– pip install setuptools wheel
– Install VC++ 2015 Build Tools, including the Windows 10 SDK, found here: https://landinghub.visualstudio.com/visual-cpp-build-tools
– Install GNU Gettext, Windows builds can be found here: https://mlocati.github.io/articles/gettext-iconv-windows.html