If the site is correct, the first 40nm GPU from NVIDIA would arrive months before the first high-end 40nm chips from ATI.
There will be at least two new 40nm SKUs and Nvidia is aiming for a launch in early Q2 2009. Some sources indicate that Nvidia might even make it to March, which is the last month of Q1 but this will be a tough thing to achieve.
ATI has also taped out its RV740 40nm mainstream chip and it looks that Nvidia plans to launch entry level and mainstream before it goes to 40nm with high end. Currently it looks it will be at least summer time, roughly early Q3, before we see new high end cards, at least from ATI.