Once again.....MRTC and the new interiors are seperate issues. MRTC has been done for long time now. The interiors were redone at a different time. The MD-80, 738, 767, and 777 all have the new interiors. The A300's, 757's, and F-100's too not. Plain and simple....a cost saving item. Apparently a few F-100's received the new interiors but that will no longer happen as they are leaving the fleet between 2003-2005. The former TWA aircraft are another issue.
I agree, the oldest 757's are looking rather worn these days....well compared to the brand new 738's, and the new interiors sure spruced up the workhorse MD-80's. There are about 25 brand new 757's, but they have the old-style seats.