The new map leaked during the test. It looks like quite a simple one, probably will be dedicated to low-tier battles. Though, it's just a wild guess.
At the moment, it is merely a template, a first iteration of the future map. We shouldn't expect the official introduction until the end of this year. Though, it is still unconfirmed whether the map will be included in the future updates. I guess it all depends on the public test as always.