The thing that bugs me the most is how 4G sounds like it's just going to be a marketing term to make people think it's SOOO much better than 3G. Kinda like Windows 7 since the actual OS is 6.1, which means it's a "fixed" Vista.
The best thing carriers can do for customers is give theoretical top speeds and then list some median or average speeds for certain areas. Now it does sound like 4G's guts are going to make it work better for data, but I don't think most of us will get HUGE speed boosts. Hopefully it will allow denser coverage than 3G so we don't have situations like NY and SF going on in the future.