Couple of hands on I've read said that the crease is present, but invisible if looking at the tablet straight on. Holding it at an angle you can just barely see a difference in light reflected and a subtle crease. If this is the case then the crease is NOT an issue for me at all.
Edit: Just viewed Ralfi's video, yeah definitely ripples there. I don't think they would bother me though, unless they interfere with the touch functions. I think we have to be realistic here and expect some limitations and not everything will be perfect.
The crease is just one element that bothers me. I’m just not excited about using a plastic display again. After using glass for so long, the prospects of having a plastic display really tempers any excitement I have for a device with a folding display. Hell, I hate the feel of plastic screen protectors and those are at least on top of a rigid, smooth surface...