What's so new about vB4?

[محروم.كوم]

dunno if this is the right place to post this... but here goes:
I'm pretty sure i'm missing something but what's so awesome and new about vB4 to raise the price by more than 100 bucks? I do get the free upgrade so i won't be whining about that but i haven't really noticed any awesome features on my local server...

This is what i've seen:
pure css/xhtml
admin cp is a bit cleaner (why does it still have the same old messy layout?)
new default skin...


I KNOW i'm missing something. __DEFINE_LIKE_SHARE__