Because one Hall of Fame is not enough...
Based on either a poster or a t-shirt available at WWE's shop in Dallas, it looks as if they will be introducing a Legacy Award for the Hall of Fame this year.
Ed "Strangler" Lewis, Frank Gotch, George Hackenschmidt, Lou Thesz, Mildred Burke, Pat O'Connor, and "Sailor" Art Thomas are featured in this image shared with us from a fan at the event:

Although WWE has inducted Gorgeous George, Buddy Rogers, and Argentina Rocca (contemporaries of Thesz and O'Connor), they had not honored anyone who was a major star before the advent of television.
Note that they're not listed as official inductees for the Hall of Fame as this appears to be something different.
