WC 2.2 Release Candidate 1 has today been tagged. If all goes well, the final release will be happening wednesday. You can compare the changes since beta 3 here.
If you have not tested a theme/plugin yet (what have you been doing?) you have ~48 hours to do so if you want to beat the release of the new version.
You can download the release candidate here: https://github.com/woothemes/woocommerce/archive/v2.2.0-RC1.zip
If you are testing plugins and they are not showing up, ensure you name the plugin folder ‘woocommerce’ (removing the -2.2.0-RC1) when moving it into your plugins directory.
Thanks to everyone who has contributed to this release so far!