While being interviewed for this cover issue for Empire Magazine's December Issue,  Jennifer Lawrence hinted at toast babies!
It’s not entirely true that the Hunger Games production is complete. There is, Lawrence lets slip, one last scene to complete for the very end of the series, possibly featuring her nephews in roles we won’t spoil.
Josh Hutcherson also made an interesting comment:
And the horrors exacted on Peeta will go even further than those in the the novel. “The book doesn’t explain everything that happens to Peeta,” says Hutcherson. “So we were at liberty to create that ourselves. We’re putting him through food and water deprivation, sleep deprivation, various forms of brainwashing.”