My understanding is that you can obtain draft timetables from Hitrans/Nestrans/Tactran. Failing that try Scotrail, Transport Scotland or even your MSP, local authority or community council. HML is definitely out there for consultation at the moment, I don't use Aberdeen trains so haven't been in touch about those.
There is a presentation on the TacTran website which includes some details. However, the only detailed timetable is for the HML, and they only discuss the Glasgow-Aberdeen trains for the NE. Its not clear from the presentation slides exactly what will be happening when, as they talk about what they envisage the 2019 TT will be, but the diagram suggests what the 2018 TT will be....
Also, some interesting figures on station usage, more precisely destinations to/from each major station.