DailyTech has the lowdown on the new X1950 XTX even before ATI's official press release. The X1950 XTX will feature a new cooling design and new GDDR4 memory chips. There will be a new CrossFire master card made for the X1950 series as well. And lastly, there is a new X1900 XT in the works that is supposed to be different, and yet the same as the current X1900 XT. DailyTech is not very clear on that point. Maybe the new X1900 XT will feature the new cooling design. I will link ATI's official press release here when it becomes available.
One week later and still no announcement from ATI. I will let you know when it happens.