bmi regional have just opened up bookings for 01JAN-29MAR.
Just looking at departures ex-BRS in w/c 13JAN:
ABZ - on Monday (day 1) only the morning rotation operates, on Friday and Sunday (57) only the afternoon rotation operates. Tue-Thu (234) operates with both rotations as usual.
FRA - as ABZ
HAM - as ABZ
HAJ - not operating on Tuesdays or Saturdays (day x26)
MXP - as HAJ
MUC - as HAJ
So, at first look, and without having checked any other dates, it looks like the routes are being thinned slightly, with all three aircraft only doing two rotations on Sundays, Mondays and Tuesdays. Saturday remains without any flights.
Hopefully that's just a winter thing.