There are a lot of people that will argue otherwise, but the beta version of the game that is running in multiple leagues is significantly worse.
1) QBs cannot average more than 200 yards per game.
2) QBR is < 90 for most QBs.
3) WRs move slower than DL now because of tweaks that were made to speed.
4) There are 0 effective long passes because QBs get instantly sacked since #3.
5) All of the current problems with the passing games - no downfield passes, all dump offs, etc. - are still there.
Which is to say I don't understand what folks are excited to see changes to the game. For all the problems with 4.5, it's stable and playable.