From what I can see from the patches...
1.4a
Gwen Halloween costume and party scene. Girls in background of pool and classes. A flirt option for girls to use vibrators
1.4b
Fixes, and trying to resolve issues with the halloween event
1.4c
Fixed issue with selecting Gwens new hairstyle
Fixed issue with accessing vibrator option
Fixed dialogue issues in Halloween event.
1.4d
fixed graphical stuff with Jean's doggy pose
fixed more issues with vibrator option
fixed issues with in class artwork.
Nothing too major except making the school look maybe more lively, and a halloween event with gwen in it. And the vibrator too i guess.