rootstock current state
I've contacted the Rootstock they provided me the following link https://github.com/RSKsmart/rskj/wiki

which provide a wiki for :

Install RskJ and join the RSK Ginger Testnet

Compile and run a RSK node locally

Getting started with Smart Contracts development

Convert your Testnet Bitcoins to Ginger Smart Bitcoins and viceversa

Besides there is a blog listing all the news : http://media.rsk.co/