Unless they change to "issue fixing" first (as mentioned in the state of the game stream) in which case GWE may not get a preserved pass in that way, who knows?
It doesn't need a complete revamp by the Preservation Team to configure the remaining locos. According to DTG it's a fairly simple matter to make locos compatible with RD. It can be done any time.
I remember the stream where they said just how easy this was to do and yet here we are still waiting. I don't wish to sound impatient but I bought TSW2 for the GWE and a little while after bought the RD on the understanding that the route will get RD support. I have hardly played the game in months as I want to use the 166 and HST with the RD but I suppose I will have to wait.