I believe smart contracts are on the roadmap for either Q4 2017 or Q1 2018. Not sure about open source. Stratis is aiming to sell complete blockchain solutions to corporations, so if they open sourced their code perhaps others could just copy it and use it, so my initial guess is no? Then again the power is in the blockchain itself, so it would be as pointless as copying the bitcoin code. I'm not sure to what degree the code needs to be open source in order to built on top of Stratis - because that is the point of it all.