They've been running a private Chainpoint testnet since March. Team has built a custom suite of tools for testing Nodes, Cores, and the entire Chainpoint proof creation and verification process. They call it Hashblaster! So far, hashblasting has gone well. They've identified some optimizations and continue to work towards a public testnet.
They set a milestone of launching a public testnet in Q2 2019 means June 30th. But it will take few more weeks to launch the public Chaipoint testnet.