Some articles about the last concert are stating that Best&More is actually a World Tour...
= 2017 Best&More World Tour
Don't get your hopes up too high though, most of the time these "World Tours" don't have any dates outside of Asia.
幻梦 Fantasy Dream, the new song, is about environment, and how as human beings we must protect our mother the Earth. Everyone can help and cherish the environment in which we live.
Studio version will be released in the near future.
Articles state again that her new album is expected to be released this summer. They add though that she's also working on her World Tour's next concert.
Sources:
http://ent.sina.com.cn/y/yneidi/2017...c8122503.shtml
http://ent.qq.com/a/20170220/021069.htm