I also am experiencing some motion sicknes, but I don't think it has so much to do with the motion as it does the awful, terrible, horrible, *** were they thinking did they even put any thought into this, color scheme they plastered all over the interface.
Text is virtually impossible to read, causing eye strain, causing headaches. The thin white text surrounded by bright vibrant colors is just awful. I noticed last night when I was in a call and pressed the home button, the green bar at the top of the phone to "return to call" is virtually unreadable. If I didn't already know what it did, there is no way I would know that pressing the green bar at the top would take me back to my call because you just can't read it. At all.
I'm young, I can't imagine what older people are experiencing. I specifically instructed my grandma NOT to update her iPad because there is no way she will be able to read anything, and since there's no going back if she does update - she's done with her iPad after that point as far as I see it.
The white background with brigh and/or light colors is the worst idea in the world. Everything is just awfully designed. Any introductory design class on color schemes would tell you to do the exact opposite of what Apple did with iOS7.
I fully understand Jony Ive and his whole simplicity thing and I can see how the white backgrounds and bright/light text fully fits what he believes. But it doesn't work here. Simplicity is great, when it works, but when you do it just for the sake of doing it like Apple did with iOS7 it just doesn't work.
They just took it way too far, all they have to do is make it readable and useable again by scaling back their whole design scheme. They just took it way too far.