We all pretty much knew that she has been working on the sequel to ‘The Host’, but this was apparently her official announcement of it while she was in Philadelphia. She’ll be calling it ‘The Seeker’, which she had also previously mentioned. You can read the article about it here:
She also was interviewed by the associated press in Miami about where the trilogy is going to go from here. These articles all say pretty much the same thing, but you can read about them here: