John Danks will indeed be attending Soxfest this year.  Danks was added to the Soxfest roster almost immediately after agreeing to a contract for 2010.  I expect that the Soxfest lineup is now set.  The final lineup:

Harold Baines
Floyd Bannister
Gordon Beckham
Mark Buehrle
Don Cooper
Jeff Cox
John Danks
Ed Farmer
Freddy Garcia
Ozzie Guillen
Ken "Hawk" Harrelson
Roland Hemond
Kevin Hickey
Joel Horlen
Darrin Jackson
Bobby Jenks
Lance Johnson
Ron Kittle
Paul Konerko
Mark Kotsay
Doug Laumann
Scott Linebrink
Bill Melton
Minnie Minoso
Juan Nieves
Jayson Nix
Jake Peavy
Gary Peters
Juan Pierre
A.J. Pierzynski
J.J. Putz
Carlos Quentin
Alexei Ramirez
Mark Salas
Moose Skowron
Steve Stone
Mark Teahen
Matt Thornton
Greg Walker
Ken Williams