There is nothing to be revealed. The 8G-DCT, like the 7G-DCT that it was derived from, has an integrated control unit. The control unit sits inside the transmission and is mounted directly to the valve control plate. It communicates with the ECM via a CAN bus, through which it receives gear shifter position (D, N, P, R), transmission mode button (Eco, Comfort, Sport, Sport+, M), and paddle shifter inputs as messages. It performs the shifts accordingly by controlling the valves, solenoids, and relays that actuate the shifting forks and clutches while monitoring pressures, temperatures, and positions of various internal components. The TCM only communicates with the ECM, nothing else. All inputs and outputs are communicated through the ECM, which in turn communicates with other sub-systems and control modules. On top of this complexity is the fact that the 8G-DCT does not have a single fixed first gear, but rather a "winding first gear" that is a composite of gears 3, 4, and 2, through the use of a synchro that binds gears 3 and 4, thus locking the odd/even shafts together which normally operate separately. Consequently, there is no "pre-selecting" a gear for the 1-2 or 2-1 shift.
It is impossible that Lotus has somehow replaced this Mercedes TCM with a Bosch control unit.
I have also heard the mention of a Bosch control unit. What that may be is an interfacing box between the Mercedes TCM/ECM modules and the rest of the Lotus car. For example, the Mercedes TCM/ECM takes inputs from the steering column, coolant temperature, wheel speed, and parking brake status, and in return provides warning codes, current engine/transmission status, and cooling requests. Instead of teaching the Lotus boxes to speak Mercedes and vice versa, an "abstraction layer" box sits in the middle and translates between the two systems.