Yes, the based TUI metal 738 has been known about for a while (current LTN based machine coming up North)
What is new (and being far away, subject to change) is that the initial W18 plans suggest the ABZ summer base continuing for the winter.
Below is an example from the TUI website:
TOM 1346
Aberdeen (ABZ)
Tenerife South (TFS)
WED 05 DEC
08:45
13:35
Direct: 4 hrs 50 min
TOM 1347
Tenerife South (TFS)
Aberdeen (ABZ)
WED 12 DEC
14:50
19:35
Direct: 4 hrs 45 min
The timings suggest a possible ABZ based aircraft but currently only the usual 2x weekly TFS rotations are bookable. Will be something to keep an eye on. Difficult to imagine there being enough pickings to go around in the winter months to keep a based unit busy enough though.