I first interpreted that as 'Cocos Creator will be deprecated' rather than 'closed source'!
Then I found a quote (Google Translated)
"2016's first salon, in addition to official development will bring you the latest developments and technical highlights Cocos engine, but also a grand launch of groundbreaking new products Cocos Creator, it hugs the script, lower technical threshold, significantly improve the game development efficiency, allowing more people to be able to efficiently develop their own games. Cocos engines founder Wang Zhe Great God will live and everyone Secret!"
Now I am excited again!