I just asked the dude at the Genius Bar if they had taken delivery of the new iPods into the store yet. He said "I have no idea what you are talking about..", with a wry smile on his face - seems even the retail staff keep their mouths shut when it comes to keeping secrets. Steve got them well trained, lol.
*sigh*
You do know that Apple Store employees are as clueless as you are about upcoming updates right? In fact even Apple employees working on campus won't know unless they are directly involved with the product in question.
My take on all this:
The beat goes on
This is a direct reference to the Beatles' last press release. So yes, expect to see some sort of Beatles announcement. We already know their catalogue has been remastered for digital release, so this 45th anniversary is as good as any date to release it. You'll probably see either Ringo or Paul or if we are lucky both on stage.
And for crying out loud, no it does not refer to Madonna. KT Tunstall appearing has little relevance to this.
iPod Nano update
This one is a sure thing and will look like the pictures that were pulled in the colours posted. 16GB flash memory is likely.
Touch screen iPod
Seems likely. WiFi will be used for iTMS and possibly widgets (YouTube, Stocks, Weather, Trailers(?). Wireless syncing is - judging by the iPhone - sadly not going to happen. No Safari, no communication.
No radio - internet (dying because of new royalties pricing) or FM (useless in most areas of the world).
Prices will stay the same. Harddrive sizes will increase finally.
Remote control for iTunes or

TV? Meh. Not too likely. I doubt that it will stream to APEx either, but one can always hope.
The thing is, for every cool new product Apple releases, they always underwhelm us with features, the iPhone being a prime example.