Do you have wireless N devices? If not, you'll still be limitied to wireless G speeds (about 20/20).
What speed tier do you have? Unless you're on a tier faster that 25/25, you won't see a noticible improvement in internet speeds.
Well the Rev. E is functional so not sure what could be better other than the benifits of Wireless N (a faster connection speed and a better wireless range). So you need to be more specific by any improvements to any functionality?