The NSDash9 Facebook page reports that two SD40's that escaped being sent to Cresson Steel will be the prototype SD33ECO's.
It sounds like some of the former Conrail SD40-2R's will also be rebuilt in the program. I suppose that's no surprise considering that they've already traded some away to CSX for the SD80MAC's, which clearly shows their status at NS amongst their sizeable SD40-2 fleet.
I hope that N&W's original SD40 doesn't enter this program instead of being rebuilt in-kind like her Southern Railway counterpart was. Been quite sometime since that happened now and with traffic down these days and units in storage, plans may have sadly changed.
Beats the scrapyard though if that comes to pass and she's not refurbished or donated.