Also this month USCIS announced that it is publishing a Notice of Proposed Rulemaking (NPRM) to increase the maximum amount of time a Trade-NAFTA (TN) professional worker from Canada or Mexico can remain in the United States before seeking readmission or obtaining an extension of stay. The proposal will extend the maximum period of admission for TN workers from one year to three years, the same term that USCIS currently may grant to H-1B specialty occupation workers. This will be a welcome change for those TN workers coming from Mexico and Canada.

http://www.uscis.gov/portal/site/uscis/menuitem.5af9bb95919f35e66f614176543f6d1a/?vgnextoid=688960f669fb9110VgnVCM1000004718190aRCRD&vgnextchannel=68439c7755cb9010VgnVCM10000045f3d6a1RCRD

Any time line on when this could become law ?

I really don't think this is going to happen especially with Elections in US and the economy. Atleast not in the near future.

From my experience the last three elections 2000 (dot com bust), 2004(one war),2008 (two wars + food price + gas prices) the economy has always been bad / worse.