still need help. I am late in filling 1040(2011) for rent loss i

I am still late in filling 1040(2011) for rent loss in tax year 2011.

Shall I use form 8582(2012) or 8582(2011)? The reversion date 8582(2012) is some day

 in year 2012 by IRS.  The reversion date 8582(2011) is some day in year 2011 by IRS.