They are distrubiting WCT since january. If you keep waves on official waves wallet, you gain wct. And you can sell them on dex. But i do not advise you to sell them. It is too early to sell 

"The Waves Community Token (WCT) is intended to provide a tool for community assessment of crowdfunding campaigns launched on the Waves platform and incentivize long-term holding by providing an additional income stream for WAVES token holders in the form of regular asset distributions. WCT will be a virtual community organization. It will be launched in several stages based on the technical maturity of the Waves platform. "