So far rumors are saying it has 64 unified shaders capable of 4 shader operations per clock cycle, clocked around 700MHz with 1GB of DDR4 RAM on a 512-bit memory BUS. Of course, these are rumors so whether or not the R600 will be as described will only be known once the card is released.
-I heard Jan. 30th,
-Some GDDR-4 ammount greater than 512
-64 FOUR WAY shaders (this is a marketing thing, hence "nVidia may have 2x the shaders as us, but our shaders do 4x the work")
Then, pretty much what everyone else said
BTW, i'd wait, cause think of it this way. Why would ATi take an extra, what, 4-5 months, and release a lesser performing card? Come on, if ATi did this, they would be screwed.