Does the latest versions make people sick after prolonged use? How similar does it feel to looking at real far away objects? Is it easy to tell it's not 3D and the screen is flat? If I tied a passed out "friend" up and put on the Oculus Rift glasses and played a movie of them being thrown out of a helicopter from 1st person, would they be able to tell that it was fake or is there a perceived feeling of it being real?
The bad news is that while better tech in the DK2 and better design in new software can significantly reduce motion sickness, I doubt we will ever completely eliminate it.
The really bad news is that nausea is funny. It's great for catchy headlines and quippy comments. I'm really afraid that the Rift will get a reputation as a "vomit helmet" and that will lead the masses to dismiss it. That would be a tragedy.
It's really important PR for VR to get the word out: If you feel sick, stop. Don't try to push through, you'll make it really bad. Try again much later. With practice, it will get better and better. When you get over sim sickness, all kinds of awesomeness awaits!