Is there any advice from GDE regarding this impending "shifter of doom" recall?
It has not yet been rolled out for the EcoDiesels, but I don't imagine that the procedure listed in Safety Recall S27 will differ. Salient excerpt:
SPECIAL NOTE: The four modules must be reprogramed in the following order:
1st - Powertrain Control Module (PCM)
2nd - Transmission Control Module (TCM)
3rd - Radio Frequency Hub (RFH)
4th - Instrument Panel Cluster (IPC)
You'll notice an obvious issue here for GDE tune users who did not obtain a spare PCM. Either the PCM gets overwritten during the recall and needs a replacement GDE flash (which would be the ideal scenario), or if the GDE firmware is "nuke proof" and prevents the dealer overwriting it then the recall software is in a metastable state where it has only been partially applied. This could conceivably cause issues with the other TCM, RFH, and IPC systems expecting new functionality from the PCM that is missing due to remaining on the GDE-modified old firmware.
Conversely, if one obtained a new, "post-shifter recall" version of the GDE firmware then it would seem likely to have a dependency on the other systems having their updates applied as well.
I really doubt FCA engineers QA'd the scenario where the other three systems were upgraded and the PCM was not, or the scenario where the PCM was upgraded and the other three systems were not... especially given their explicit notice about which order the firmware updates must be applied (not to mention their track record).
Finally, I speculate
concern that future versions of the GDE firmware would be based on the recall version of the firmware—implying that if you don't want this "shifter of doom" recall performed on your vehicle you might be SOL in the future if you want the latest and greatest Hot Tune firmware from GDE.
Therefore, I recommend that all GDE firmware users wait to have this recall applied until GDE indicates the correct course of action.