Will the US 6 Willimantic Bypass get exit numbers at the same time Interstate 384 gets mileage-based exit numbers?
I'd assume so, unless CTDOT jumps the gun and adds them first. I saw some evidence of that on CT 3; the gore signs for Exit 13 and 11A SB are uncovered (though 11B is blacked out), the new services sign for Exit 13 has its numbers revealed, and the mile markers are in place.
No, they won't. They just redid the sheet metal signs on the US 6 Expressway in the last year or so and the exit gore signs got replaced with numberless ones.