Zatanna is one of the most powerful superheroes in DC and hopefully this leads to 'Zatanna' and 'Swamp Thing' solo movies. A 'Solomon Grundy' Horror movie would also be awesome.
I have always thought Solomon Grundy is the perfect character for his own Horror movie. He could easily be the next Jason or Freddy if handled right and if they are going to make a Joker solo movie I think Solomon Grundy should be next. They could have the movie focus on his origins with him as Cyrus Gold at the start and show his transformation from a drunk into a scary 13 foot tall zombie who likes to carry around decapitated heads and arms saying ‘Born On A Monday…’ They could even use Ra's al Ghul as the hero and I don't know if you have ever played the ‘Arkham’ games but in them it was the green stuff in the Lazarus Pit that transformed Cyrus Gold into Solomon Grundy when he was hit by lightning.
Ra's al Ghul captured Solomon Grundy and experimented on him to find out why he didn’t age and when he discovered it was the green slime he perfected it into some formula that allowed him to have eternal life without turning into a zombie too and created the Lazarus Pit and in a lot of comic books it is always said Ra’ was good like Batman to begin with but years of using the Lazarus Pit had corrupted him so they could have him as the hero of the movie.