In regards to MRTC, all AA 757's have been converted. AA is still in the process of putting in new overhead bins on the 757's. It will be awhile before AA starts putting in Recaro coach seats on their 757. Money is the main issue of course.
The new 757's that AA started taking delivery of last year have the panelling, bulkhead design, and carpeting as AA 737.
Never take financial advice from co-workers.