The assumption is the film will focus on the children of Luke, Han and Leia and the below descriptions do little to discourage that idea. While long time fans who have kept up with Star Wars through the books (called the Extended Universe) are hoping they might be the characters of Jaina Solo, Jacen Solo, and Ben Skywalker. I could see the names being used because Lucasfilm (aka Disney) owns them but nothing about the Extended Universe will be used. I doubt JJ Abrams' is even aware such a thing even exists and will have no interest in trying to tell stories that doesn't interfere with it. Nor does Disney care as the books are but a drop in the bucket compared to the merchandising from the new movies and so from their perspective they are probably fine with the books doing their thing as long as profitable but those stories are irrelevant to their movie plans. So now on to the descriptions.
Late-teen female, independent, good sense of humour, fit.
Young twenty-something male, witty and smart, fit but not traditionally good looking.
A late twentysomething male, fit, handsome and confident.
Seventy-something male, with strong opinions and tough demeanour. Also doesn’ t need to be particularly fit.
A second young female, also late teens, tough, smart and fit.
Forty something male, fit, military type.
Thirtysomething male, intellectual. Apparently doesn’t need to be fit.