As fDAL, I got the same letter. It basically said that if you gave notice that you wanted to return prior to the 10-year window closing, the company would extend your recall rights to the 14-year point. During this four year period you will be required to return at the first offer of a training date.

I don't think any modification to the PWA was ever made.

If they apply this standard, I suppose any pilot that has not put in for recall at the 10-year point could be dropped off the SL. The rest will remain until 14-years or the next hiring cycle, whichever occurs first.