I think an upgrade to the SE would be worth it. I was disappointed with the letterbox format of the current version. Frankenheimer always looks great in anamorphic widescreen, and I hope they take the time out to source a good master or at least do some restoration to clean-up the print and eliminate the transfer artifacts. New extras are welcome of course.
By the way, this is getting the SE treatment to promote Jonathan Demme's remake which is scheduled to come out sometime this year. Pretty stupid exercise if you ask me, plus in true Hollywood PC fashion, they got Denzel Washington to take over Sinatra's role. And this takes the cake: Meryl Streep is playing Eleanor Shaw! ARRRRGH!
To quote Harry Knowles: "I have nothing but absolute fear for this project..."