Kenneth Paolini, Christopher Paolini’s father, has asked for the Eragon fansites to post the following:

We urge fans not to respond to people claiming to be Christopher online. Christopher has not never communicates with fans in that way (since early 2003).

Also, no one has read any part of Eldest, other than his editor, agent, and immediate family.

If you have been contacted by someone claiming to be Christopher, they are fake.