The 1600MHz DDR3 modules will be available in retail stores soon, the 2000MHz modules haven't entered production yet.
Here's a quick look at Corsair's DDR3 memory lineup:
“Corsair is supporting the industry’s transition to DDR3 with a full line of highly-engineered memory solutions. Our partnerships with leading technology companies and suppliers have allowed us to be first-to-market with the world’s fastest production DDR3 memory and demonstrating our next generation DOMINATOR running at 2GHz,” said Jack Peterson, VP of Marketing at Corsair. “DDR3 memory technology brings scalability and features that DDR2 cannot deliver. The fact that we are able to realize 50% more memory speed rating at launch compared to the standard DDR3-1066 specification is simply stunning.” continued Peterson.
Corsair Dominator TWIN3X2048-1600C10D - 1600MHz - 10-8-8-24 timings
Corsair XMS3 DHX TWIN3X2048-1333C9DHX - 1333MHz - 9-9-9-24 timings
Corsair XMS3 Classic TWIN3X2048-1333C9 - 1333MHz - 9-9-9-24 timings
Corsair XMS3 Classic TWIN3X2048-1066C7 - 1066MHz - 7-7-7-21 timings