A season pass it's not like a battle royals game. No theres not a season pass. Theres a deluxe edition.
I think a big part of the loco stuff from TSW will be portet to TSW2 step by step after the TSW2 release. The reason is, that the current stuff in TSW at german and BR routes is the typical stuff like in real. I can’t imagine, that there is no DB BR 185 for german freight services in the future. A hint for that is the implementation of Sand Patch Grade and the Talent 2 in TSW 2.