Unfortunately, McDonald's can't tell the difference between the real thing and (illegal!) copies, so Fritz Hansen (the Danish company who manufactures the chairs) have stopped the collaboration with McDonald's.

Here's the press release (pdf)

interesting timely press release carlina!

I just read about this issue earlier in the week. When I was in UK last year, I say a pair of egg chairs through the McD's window and just assumed they were fake, the rest of the decor was still plastic and such. I should have taken a better look had I known.