Actiontec MI424WR Rev G Wireless Router vs MI424WR Rev I - What's the difference?

I just found out that I have a MI424WR Rev G wireless router which I bought by mistake (wanted the latest version "Rev I"). I signed up for Verizon FIOS Internet with the 25/25 Mbps plan and haven't hooked it up yet.

What's the difference between Rev G and Rev I? I am using the router primarily for internet connection for my laptop, desktop and TV (to access Netflix, Hulu, etc..)

Will I need anything to make it work or is it just plug and go?

I've never owned my own router so I'm a little new at this.

Thanks for your help!