If you can't sit through the cringe, this is the rundown:
TS17 is your usual meaningless yearly update with different DLC packs, including South Wales Coastal, Hamburg Lübeck and two other routes.
TS17 Pioneers Edition is a limited time offer with the same content as TS17 + Semmeringbahn and also access to the TS World beta.
TS World is the new game utilising Unreal Engine 4 and will be available on PC & Xbox One. There will be no backward compatibility for addons in the existing TS series. Includes such genre redefining features as walking around and decent performance.