Got it on my iPod Touch 4th gen finally. The servers are swamped. If you get a 3200 range error, it's because the servers are too busy to verify the IPSW file. Just keep trying I guess.
The new notification center is nice, as is the over the air sync, and the fact you can now use the iPod while it syncs is cool.
I did notice email retrieval is a bit sluggish for some reason now.