Just was thinking that it would be nice if the iPad 2 had a TV tuner. I wonder if Apple will ever consider adding it in the future. Is there any way to get TV on the iPad2 without an internet connection?
No. Neither away from home nor without an internet connection. There are hardware+software solutions that enable you to access your cable box from the iPad but they require hardware attached to the TV/cable box and an internet connection on the iPad.
However, it's probably not as portable as you would like. It must be plugged in and requires an external antenna and a WiFi router. If your iPad is jailbroken, running MyWi on it could probably take the place of the router.
As a bonus, this device also acts like a SlingBox to broadacst your video sources across the internet to a remote location.