Regulations.gov
Look it up under:
"Due for comment in the next 15 days"..... then category (left side of page)
"Aerospace and Transportaton".. it will be the first proposal followed by input from others and any changes made.
This is a 51 page "easier to read" document of the proposed rule changes. You may find it interesting that 80% of Part 121 Regional Airline SIC do not have an ATP. More interesting 15% of Major airline SIC do not have an ATP (They don't need one unless they upgrade to PIC and may never have gotten one if their career path took them straight into a major airline right seat, without being a PIC in Part 121 - which of course was possible in years gone by).
So, not only will the Part 121 Regional SIC's get an ATP/Type Rating check ride before next Aug 2013 (subject to them having 1500hours), so will those SIC's sitting at the Majors in the right seat hoping for retirement and knowing or desiring never to upgrade.
Additionally, any existing Regional SIC's who (say, they are on reserve) don't fly much may be jumped in seniority for upgrade, if they a. aren't 23 years old, b. don't have 1000hrs Part 121, or c. have 1500 total time in order to have an ATP/Type Rating checkride before the August 2013 deadline.
Should be interesting to see how this plays out...