About PrestaShop 1.6
The 1.6.x branch of PrestaShop is the next version of PrestaShop.
It is currently under development. You can see it get better here: https://github.com/PrestaShop/PrestaShop
Documentation for PrestaShop 1.6.x
Versions of PrestaShop 1.6
Here are the 1.6.x branch release dates :
PrestaShop 1.6 alpha 1 (v188.8.131.52)
November 20th, 2013