Hi,
New steppings are now available.
Yorkfield C1 went for E0 stepping, Wolfdale M0 went for R0.
E0 introduces new power states (C2E, C3, C4 called as Extended Stop Grant State, Deep Sleep State, Deeper Sleep State), changes in PECI implementation, new two instructions added, halide free package and some other minor changes as well.
OC abilities atm unknown :D
J.