I've always assumed there would be a crease, and I'm still buying one. But there's no denying the fact that Samsung said there wouldn't be a crease after the leaked hands on videos appeared.
I've contacted Vincent who wrote that article. He says he's at a Samsung office this Thursday so he will ask why they made that statement when there is definitely a crease.
My hypothesis is that they can indeed make one with no crease when it's new, but in time one will develop anyway, so they did it in purpose to stop everyone complaining in a few months and causing them problems.