Looks like the frame-rate is much more solid, auto-aim is in, load-times have improved by the looks of it -- someone also stated (who played a near final version of MGS 3) that the loading times are on par with MGS 2 which is great.
Link, http://down.videogamerx.net/scek_million/festival/mgs3.wmv
Link, http://down.videogamerx.net/scek_million/festival/mgs3.wmv