Sony first announced its speedy new Memory Stick PRO-HG Duo cards all the way back in December
, but it's now finally gotten a bit more specific about them, including providing the all important details on pricing and availability. Set to be available in 1GB, 2GB, and 4GB capacities, the cards boast a new 8-bit parallel interface that Sony says translates to a 30MB/sec transfer rate, which makes 'em about three times faster than the standard Memory Stick Pro. To take advantage of all that speed, Sony's also providing an ExpressCard adapter for the new Memory Sticks, although they will still be compatible with standard 4-bit parallel interface hardware, albeit at a significantly reduced speed. While there doesn't appear to be any word on how much the adapter will cost, you can look for the cards themselves to set up back $60, $90, and $150 for the 1, 2, and 4GB variations, respectively, with all three available in August.