The release candidate for WooCommerce 2.7 “Bionic Butterfly” is now available!
Shipping a release candidate (RC) means WooCommerce team think it’s done, but with hundreds of thousands of stores and so many plugins and themes which declare WooCommerce support, it’s possible WooCommerce team missed something. They hope to ship WooCommerce 2.7.0 on Tuesday, March 14th but need your help to get there!
Since 2.7 is now in release candidate stage, only bug fixes will be made. No other changes should take place.
Source from WordPress WooCommerce blog