Looks that GT200 is also going to be ready for late Q2 launch. We only have some limited data, but the chip that we call GT200 is tapped out and the prototypes of the card are already up and running.
The device is known as Nvidia GT200-300 and this naming scheme might implicate that this is something that we've seen listed as D10U-30.
We can only speculate is this a 55 or 65nm or if this card has one or two chips, but we can confirm that this configuration has 1024MB of memory.
The chip, however, is called GT200-300. The shocking part is that both R700 and new GT200 might be launched at roughly the same time, or very close to each other.