New Ticket to Ride Game
As another poster noted, the Ticket to Ride app isn't downloadable anymore, being replaced by an entirely new app by Marmalade Studios, which apparently will be using a learning instead of the pre-programmed strategy bots of the 'Classic' app.
Apparently no purchases or save data will carry over to the new app which is disappointing. And from the screenshots available on the Steam page it will use different aesthetics than the physical game and 'classic' app.
It'll no doubt take years before all the maps from Classic get added, let alone any new ones. So I guess it's official; no new maps for the foreseeable future. I'd hoped the Poland files being in the Steam files would be a sign it was coming soon.