Feel like beating a dead horse, but I'm still holding out for B36-7's with kinematic pilots and scale coupler mounting pads, and a set of NJ Transit Arrow-series MU railcars (multiple phases, too). Maybe Lionel got the MTH tooling for the L-series NYC Mohawks? Those might be nice to see with LEGACY.
For a more realistic expectation though, maybe a rerun of the Pennsylvania M1A/M1B - the latter hasn't been seen since 2008 - and the Dreyfuss Hudson with multiple tender and deco variants. Still holding out for a rerun of the F-19e Chesapeake & Ohio George Washington 4-6-2 Pacific's, too...