Okay, I'll explain a little bit more.
I'm running build 8A293. I don't know if this is Gold Master or not. I am running it on a 2G iPod touch (8GB) and I noticed a couple of things:
* the icon animation after sliding to unlock is similar to iPad now. It's a very neat animation
* the system overall is much faster. I've compared it to an iPod touch 3G running iPhone OS 3, and mine is notably faster. In fact, I believe this iPod is technically very capable of multi tasking. Apple is deliberately disabling the feature to make you upgrade. This is good news to iPhone 3G users, because I always felt the iPhone 3G was sluggish. This update should improve its performance
* the dock is now similar in appearance to the one in OS X. Actually, I remember it looked like this on every 1G iPod touch before iPhone OS 2. It just returned
* folders work, and very well too
* there is NO home screen background possible in any way. If this is the Gold Master I'm using, then I'm sorry for all iPod users (including myself

)
* dubble clicking the home button does not bring up the multitask menu. Instead, it does what it has always done: bring up the iPod quick controls
* some of the icons have slightly updated, including weather, safari, calculator and I think clock too but I'm not sure
* Game Center is a new app, but since I don't have any friends I can't check it out. My username is Cloudsurf3r
* there is no battery percentage indicator as far as I'm aware