It may be that they are planning to bundle a Killer 2100 card with Big Bang motherboards, or perhaps embedding the technology on certain boards. The latter doesn’t seem too far-fetched considering the Killer 2100 has already been married with a graphics card -- the Killer HD 5770 from VisionTek. Pairing the technology with a gaming oriented motherboard to smooth out online play makes much more sense than the VisionTek offering in our opinion, as you are less likely to replace the board on a future upgrade compared a year-old mainstream graphics card.
We'll have to wait and see what exactly will be revealed at the show and if the pairing -- in whatever form it takes -- will be worth the investment. A standalone PCIe Killer 2100 card currently goes for about $80 on Amazon.