The search is on for Star Wars VII cast

The first casting call for Episode VII has hit the webs and been confirmed legit by Lucasfilm. This means the script is well advanced.

Who are they searching for?

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.

Does this mean the twins theory is correct? Or are they children of other key Stars Wars characters?