It was originally reported early on in this thread that there was a pension increase for retirees ($500/month) that was negotiated into the new contract for 710 UPSer's and that the details were listed in "a letter".
As it turns out, the 710 Pension is a multi-employer fund that did increase benefits to all retirees in the plan and was indeed detailed in a letter.
....but it wasn't exclusive to UPS retirees, nor was it as a result of any contract negotiations.
It was done by the funds Board of Trustees, presumably due to funding levels and all retirees from all the companies under it's umbrella received the increase.