Snow Leopard will have Grand Central for upping the limit on current thread counts & OpenCL to provide GPGPU functionality when Larrabee hits.

"If Apple plans to continue with its current product mix, Intel's roadmap gives Apple the opportunity to hit the ground running with a June 2009 (or thereabouts) launch of Snow Leopard accompanied by a completely revamped Nehalem-based – Clarksfield-based MacBook Pro and iMac, Auburndale or Clarksfield-based MacBook, MacBook Air and Mac mini, and Gainestown-based Mac Pro and Xserve – product lineup."