The first point, about FS17 DLC, was picked up from an interview Martin (Amboss) and Jos (Rahkiin) did with YouTube channel "Burning Gamers". Around 10:30 they start talking about DLCs, both third party and Giants own.
The second point, about the vehicle roster, was from an Playstation Lifestyle story, written after Focus Home Interactive's "What's Next" Event in Paris, back in February. That one line I wrote, is admittedly a bit out of context. Here's the full paragraph:
Hope this helpsDuring the presentation, we were told Farming Simulator 19 currently has 38 new vehicles. This number may even grow by the time the launch date arrives, but still, to have over three dozen new vehicles to choose from is quite a large number, especially when you add it to an already impressive stable.