Nehalem boards will include SLI support
Nvidia will enable SLI on X58 with an nvidia bridge chip like on skulltrail.
Foxconn also has plans to make an X58 board with SLI support.
Source: An Anonymous SMS to my mobile phone ;)
Quote:
High-end platform vacancies will be nForce 200 + X58 programme to bridge the bench, made in the Intel X58 motherboard to join a code BR04 to bridge the nForce 200 chip, for the X58 SLI motherboards provide technical support to replace the chip to provide high-end home Intel SLI platform.
Source
Translation