I spoke to multiple Delta text message agents today and after a few minutes "Bob, Customer Experience Supervisor" confirmed. "Our pre-select information is not available at this time, and i would not be able to provide a time frame when this would be available."
not sure how widespread this is but seems to effect more than just 737X aircraft. .. well i have seat in row 2 on an odd # flight so maybe FEBO will treat me well. Also when I get my PDB I'll ask the FA to "save a steak for me, please". haha. gotta work all the angles.