Beware The Batman Synopsis (slightly paraphrased): Batman must team up with sword-mistress Katana to face a criminal underworld ruled by Professor Pyg, Mr. Toad, Magpie, Lunkhead, Anarky, Junkyard Dog, Doodlebug, The League Of Assassins, Humpty Dumpty, Simon Stagg, Tobias Whale, and Phosphorous Rex.

Before I start this article, there is something I need to clear up. A lot of people are confused as to whether or not Beware The Batman has been cancelled or not. And the answer is no. It has been put on hiatus. A lot of people have been mistaking hiatus for cancellation. "Hiatus" just means a temporary delay. The series will return in January with brand new episodes, the first of which is "Attraction," in which Magpie returns. Everybody thinks the show will get cancelled at the end of it's season, however, because that's what happened when Young Justice and Green Lantern: The Animated Series were put on hiatus. Season One of Beware The Batman will compose of 26 episodes, 11 of which have already aired.
With that being said, a few weeks ago I posted an article (click the source link to read it) of which villains would appear in the show that haven't already. To write the article, I had to dig through some pretty old announcements. Well, I have stumbled on to some updates.
Troy Baker, having voiced Joker in Batman: Arkham Origins, will provide the voice of the show's version of the Gentlemen Ghost, who, in the comics, is a 19th century criminal resurrected and now haunting DC's finest heroes. Gentlemen Ghost had previously appeared as a recurring villain in Batman: The Brave And The Bold.
Ra's Al Ghul will be voiced by Lance Reddick. We previously got a look at this show's Ra's Al Ghul when we saw his mummified body in the episode "Sacrifice." Ra's Al Ghul is the only confirmed A-list villain in the series, though Wikipedia claimed, at one point, that Black Mask would appear, which is unlikely.
In the last article (click the source link for more), I mentioned that Solomon Grundy was rumored to appear alongside confirmed villain Gentlemen Ghost. Well, now Wikipedia claims Grundy will be voiced by John DiMaggio. It is worth noting Wikipedia is not the most trustworthy website, but they're not always wrong either.
And lastly, Hush is rumored to appear. NOT CONFIRMED, just rumored.
Give me your thoughts below.