My interpretation is:
WDS-1 is capable of 192/24 on all inputs.
Native driverless USB Audio Rev 1 on Windows allows for 96/24 w/o drivers.
Windows PCs support 192/24 via USB Audio rev2. You need to install the driver from Woo's site for this.
Macs have native support for USB Audio rev2 and do not need external drivers. It supports 192/24 out of the box.
I say "interpretation" because I haven't taken the trouble to read the whitepaper on USB audio standards, though I'm confident that's how things roll.
@MorbidToaster: They've started shipping now. Some stores around the globe have their pre-order status changed to in-stock.
Edited by BBBill - 3/27/12 at 9:54pm