I haven’t seen anything on the roadmap for updating Cocos Creator to work with the latest Spine files. I guess the Spine team updated the JSON format and they’ve suggested reaching out to your team to see if you could update stuff on your end. I’m not too sure what is required, but one of their team members had this to say:
They can simply fetch our latest sources for spine-cpp from our 3.8-beta branch and integrate it with their Cocos Creator code base.
Thread here: http://esotericsoftware.com/forum/Error-export-spine-to-Cocos-12076?p=53987&hilit=cocos+creator#p53987