I can't say for sure, but in related news there's a Cyan pack that includes Myst, Riven and URU+expansion (and three other Cyan titles, their earliest games) available on Steam
As far as I'm aware, the online aspect of the game has been closed for a while now. However, Cyan has released the source code for the online aspect for freeware, so maybe one day a dedicated team can get the game back online again
