In order to reduce the cost of the unit, Sapphire went with a 4-layer PCB design. This has the side effect of making that model have no CrossFire support:
Due to the PCB reduction, the internal CrossFire connectors are absent, so the card will not be hardware CrossFire compatible.
Supposedly, however, with software updates from AMD this will change, enabling latent CrossFire functionality without the need for a cable. The cards aren't available yet, and won't be for a while as AMD has yet to officially release these GPUs. They are expected to do that in July.