I really think the legend they'll announce tonight is Jim Thome mainly because of all of the White Sox stuff they have been posting on their twitter and instagram. Although he is mainly known for his time with the Indians he hit over 100 home runs on the White Sox and it would make sense because they don't really have any other legends that played for them that they don't already have in the game that make sense. The only other players that aren't in the game that are worthy and played for the White Sox in my opinion are Manny Ramirez, Bo Jackson, and if he wasn't banned from baseball I would say Shoeless Joe Jackson.
First year playing, so unsure if any of these have been in recently....
Roberto Hernandez, Wilson Alvarez, Alex Fernandez, Bobby Jenks, Bobby Thigpen, Mark Buerhle, Maglio Ordonez, Lance Johnson, Ray Durham, Ron Kittle, Robin Ventura
Unless you are talking about the old legends like Nellie Fox, Ed Walsh, Hoyt Wilhelm, Eddie Collins, Wilbur Wood, Lefty Williams types