Of the seven launch games part of the Humble Jumbo Bundle 2, only one of the games is currently available as a native port on Linux: Crusader Kings 2. That game has been available on Linux since early 2013.
The other bundled titles that aren't currently reedemable on Steam for Linux include The Incredible Adventures of Van Helsing, Deadlight, Galactic Civilizations II: Ultimate Edition, Terraria, The King of Fighters XIII Steam Edition, and Age of Empires Legacy Bundle. Soundtracks are also included and it's said more games are to be added later. Linux gamers can hope that some of these games will make it over to Linux as native ports in the near future, but it's a far cry away from the original Humble Indie Bundles that were complemented by Linux ports at start time.
Find out more at HumbleBundle.com.