I don't see where you're getting 3 mm wider from. The screen starts curving probably ~0.5mm past each edge, and my screen protector is aligned almost perfectly. As unfortunate as it is, I think this is the best that we're gonna get.
Yeah I just received Spigen Crystal protectors today and installed one just now. Ordered more than 2 weeks ago. It has the camera cut out but as everyone says, the shield is not wide enough to cover the viewable screen area. I have the screen aligned about as perfect as you can get and there is definitely a sliver of uncovered screen equally on both sides of the protector. My previous temporary cheapo shield extended just past the viewable screen and onto the bezel on both sides with no lifting or bubbling issues whatsoever.
I guess I'll just stick it out and wait for more companies to put their protectors out since the phone just came out and it will probably take some time to get it right.