Do あなた wreckon there will be a 2nd The Host??

Yes! In an Entertainment Weekly interview, Stephenie mentioned that she had 2 もっと見る 本 (sequels to The Host)mapped out in her head. She is also 書く a ghost story called The Summer House.

Yep. There's 2 もっと見る 本 supposed to come out. There supposed to be called "the soul" and "the seeker" :]