I got this update last night and there seems to be some big differences.
The ones I can tell are,
The Lock screen, home screen. well the hole sense side of it, if you got full animations on.
Email client is different.
The way texts are displayed is different.
Music player.
Notifications and quick settings.
Total Memory is now in quick settings.
Market app has changed.
and a couple more widgets.
Over all a nice little update.
I've noticed a couple of performance issues and the odd crash but I got a feeling thats down to some dodgy home screen apps. I've now removed them and i'll see how it gets on.
I wonder is there will be any more updates for the DHD.