Here is a link to a recent article about the Social Security Tribunal.
I am receiving appeal scheduling from the Social Security Tribunal for Review Tribunal legacy cases numbered 119XXX remember that the legacy cases that came over from the Review Tribunal are numbered up to 125XXX
These cases that have been scheduled applied to Canada Pension Plan disability in 2011 and to the Review Tribunal in early 2012. So if you are a legacy case waiting to be heard you are likely to be waiting until 2015 now.
Also the Tribunal are scheduling legacy cases - if you applied to the Social Security Tribunal in April 2013 and after that you will be waiting a very long time.