NV18 and RV250 should be showcased next month at Computex Taipei.
As Todd a mentioned, the RV250 will be a stripped down R200, most likely having two pixel pipelines. This may well make it faster than the 8500 in many instances as it will undoubtedly be clocked higher (possibly 300/300MHz). The NV18 looks like nVidia dragging it's arse-end through the mud again though.
The R300 will arrive about the same time as the next plethora of high-end offerings from 3Dlabs, nVidia and Matrox does. Keep your eye on Anandtech.com as they have just visited ATi and may well drop a few hints about the R300 (personally I think it will be the best card available come fall).
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