Haven't really done anything to check WiFi.
I have now spotted a few other nice wee tweeks, though:
- the e-mail app is a bit more colourful
- you can now delete or reply to e-mails direct from the notification bar
- some sounds are different to what I remember
One strange thing is that at the bottom of the lock screen is an upward pointing arrow head - like a stretched version of '^'. Looks like it ought to do something .. but doesn't