Well its fun to speculate about this so I think I will join the fun.
Lets start with some assumptions first.
1) The Iphone is new, just released, selling good but not great. (probably better than expected though).
So assumption 1, apple will try to minimize any effect the new products would have on IPHONE sales.
assumption 2, the new ipods will be osx based and have a new interface.
Assumption 3 the new nano may or may not have video but will have coverflow.
Ok lets explore.
A lot of speculation is over something called the ipod touch which would basically be an iphone without the phone.
Ipod and wif
Iphone interface
But I think even if this were the case it would not be released as early as september 5th, it might be anounced as a coming product , like the appletv was initially.
A iphone without the phone cabability would definitely eat into Iphone sales and I'm sure strain the att partnership, although such an animal is coming I don't see it until AFTER a 3g iphone is released and I doubt you will see that before next year.
How about the interface, A lot of the Iphone touch interface does not make any sense on a Ipod only product, I seriously doubt you will see that.
Wifi, Wifi on an Ipod would only make sense if it included wireless syncing, I suspose you could see this, but if they did that on the Ipod I also suspect an Iphone upgrade to include the functionality would appear at the same time. the Iphone is Steve's job new baby and he's not going to let that lag behind the other products. New inovations are likely to surface there first.
Now for the Nano:
I think video on the nano makes very little sense for that form factor.
So here is my prediction for weds.
1) New osx based Ipods.
A new nano with embedded osX and coverflow.
A new video ipod (for the christmas season)
Widescreen, no wifi , some type of virtual clickwheel but not resembling the iphone interface.
3) something Jobs hinted on in the last event, Improvements to appleTV, probably more links to outside content, maybe a ajax based browser similar to the iphone with web 2.0 as the primary language.
4) new partnership deals for content
5) somekind of Iphone upgrade to add capability that wasn't ready at launch, more flexibility on layout customization maybe.
6) ringtones from itunes
Here's some additional stuff that is possible and I would like to see.
1) Iphone upgrade with an improved webkit that includes google gears this will allow persistant storage of web pages and data on the phone.
2) Limited partnership with some companies (pray for slingmedia) for 3rd party apps.
So these are my predictions, I think they are a bit more conservative than what some are predicting.
