Get ready to be disappointed lol.
There aren't many changes at all and really the ones that were made aren't all that significant. Some options in the properties of lights and some other objects have changed.
LOL the only changes I saw was a few arrangements with menu display, and a fancy new red icon, oh, and the keycard object still crashes the game, they didn't fix it, lol, lol,lol
Red limits breached?, Yep, (20,000 fces and its still going !)