Lionsgate only has a couple of hugely profitable franchises: Twilight and The Hunger Games. It was only a matter of time before they revisited one or the other, and according to THR, it'll be the latter. Hunger Games trilogy author Suzanne Collins is currently working on a prequel novel set 64 years before the events of the first book, and Lionsgate is reportedly working closely with Collins to develop a prequel movie based on her story. The novel, which hits shelves in May 2020, revolves around the 10th Hunger Games and... that's all we know at the moment. It's not surprising that Lionsgate is returning to this well; they previously licensed The Hunger Games for theme parks and live concerts (where you watch a bunch of teens slaughter each other while singing and dancing? I guess?), and a prequel was brought up as a possibility in the past.
It seems incredibly unlikely that Jennifer Lawrence would return to reprise her role as lead protagonist Katniss Everdeen – unless they do some Titanic bookend bit where Lawrence wears like 10 pounds of old lady makeup and reminisces about the 10th Hunger Games, which she wasn't even alive to see. In any case, get ready for the return of Purge For Tweens.