Howard, the CompactFlash Association only finalized the specification for these cards at the beginning of December, 2011. Apparently they may end up being known as either XQD or QXD cards.
Sony announced that their version of this card will be available in February (no specific date yet). Sony will be selling the 16GB version for $130, and the 32GB version for $230. Card readers for the card will go for $45.
Sony says that the cards have data transfer rates of up to 1Gbps/125MB/s write and read.
Sandisk is expected to have their versions of the card out soon, but haven't announced an expected release date so far.
Sandisk, Sony, Nikon, and Canon apparently were at the center of this card's creation. Canon will be announcing cameras in the future which will be using this card too.