I don't know how likely it is that Ms. Collins will do prequels/sequels/spin-offs, but I seriously love that she has so much potential with this universe. I mean, we're talking 73 years worth of Games before Katniss and Peeta even come into play, not to mention the rebellion that resulted in the destruction of District 13 and any events before that.
So seeing that the potential is there, is there anything else you'd like to read about? Any character's history you'd love to know more about?
Possible Catching Fire spoilers in the comments.