They havent specified a release date but Dimitri said that its most likely still in April. Not sure if they are able to release on all platforms at the same time again though. I think we can expect more news during this week.
The Loco Addon will release on April 25th 2019. https://twitter.com/railsimulator/status/1120699055636664321
Its now available in the PS Store: (at least in the EU Store) German: https://store.playstation.com/de-de/product/EP2866-CUSA10019_00-TSWORLDDBBR15500 UK: https://store.playstation.com/en-gb/product/EP2866-CUSA10019_00-TSWORLDDBBR15500 Price: 11,49 GBP / 13,99€
i dunno i quite like the spontaneity of dlc announcements like im having a bad day and then ooooo new twain!!!
The Manual can be found here for those that are interested: https://store.steampowered.com/manual/1010131
The sound bug is still happened when you drive with this Locomotive in Tunnel. Hopefully it want be fixed next time TrainSim-Dmitri