The IRS, in October, issued a notice (2010-69) which states that regarding the cost of coverage under an employer-sponsored group health plan that is effective next year made this reporting optional for 2011 W-2 forms. There are suppose to be additioanl guidelines coming out before the end of the year to give further guidance on this issue.
For details on the notice please go to: http://www.irs.gov/pub/irs-drop/n-2010-69.pdf