Granted there may be other features that will be useful that weren't listed in the 7 "Tentpoles" but if you just focus on what Apple thinks are the top 7 new features then there really isn't much to look forward to yet:  
Multitasking - Not for 3G owners

Folders - decent, if not ground breaking, feature

Mail - noting to get excited about

iBooks - not available in UK "Yet" due to UK licencing deals

Enterprise - nothing for us end users here

Game Centre - will be fun, but only a preview in 4.0  
iAd - not a feature for users 
 
So, all in all, us UK 3G owners get a slightly improved mail client and folder support. Yay?