Hell yea we so need deltics. How they wasn't included in the ecml route was a dropped ball on dtg yet they put in a crapzuma instead or even a 91 set been better. They dropped the ball. If deltic or 91 isn't in the upcoming ecml diesel pack il go mad !!! Yes I know 91 isn't a diesel. Just saying.
The ECML diesel pack from Athena is class 47 47484 Ismbard Kingdom Brunel with additional Mk1 coaches. It will not include the Deltics and also not the 91s which are electric locomotives. I do however agree that they must be introduced soon as both are a missed opportunity at present. Missed opportunities seems to be a running theme with many missing classes across multiple routes. We have numerous 3rd party developers on board now and hopefully some of them will have a go at filling gaps with a flurry of locomotive dlc.