Probably its coming. there is mention of it in one of the scenarios. Lirr m3 came and 313 for ECW is coming. i know its not on the roadmap.
What is the mention, if I may ask? Haven't bought the route yet, so I'm especially curious about that. If I remember correctly, DTG has never teased a new DLC though a scenario, so that will be a novelty. Can't really believe it though. Still a BR 440 would be a great addition to München - Augsburg
It is speculation indeed, however the screenshot of the scenario shows that DTG is aware that BR 440's drive on that service in real life. So who knows, they *might* come in the future. But, as Sam would say, if it's not on the Roadmap, they are not working on it.