Paradox Interactive has just released Cities: Skyline's Mass Transit expansion for PC, Mac, and Linux after a previously uncertain release timeframe.

The expansion (selling for $12.99) includes blimps, ferries, monorails, and more, as well as the ability to create transit hubs and other ways to help your citizens get around.

The company has also announced that the Rock City music pack ($3.99), which features a new DJ and 16 diverse songs for the title.

[Source: Paradox Interactive]