Taking a cue from what Avatar did last year, Disney presented a 23 minute preview of TRON: Legacy tonight in IMAX 3D.  Not bad.  Rather impressive, actually.  The world of the grid was updated nicely with modern CGI.  When I first heard about TRON: Legacy, I figured I would wait to see it until it was released on DVD.  This marketing strategy worked, at least for me; I’ll definitely queue up to see it on the big big 3D screen this December.