The newest update for Voltz, 3.1.1, will be promoted to RECOMMENDED shortly.
Sadly, this is almost certainly going to necessitate a COMPLETE WIPE of your existing Voltz worlds! TAKE BACKUPS BEFORE YOU UPGRADE!
Calclavia has provided a new list of mods to include in this Voltz release. Please note that Mekanism has been removed from the pack. However, many mods have been added and updated: Buildcraft, Extra Utilities, Forestry, Galacticraft, Mad Science, OpenComponents, Open Computers, Project Red, Railcraft, and Thermal Expansion (among others.) Also, the existing Calclavia mods have seen many exciting changes!
Please note there is a hard Java 7 requirement on this pack. If you get an error NoClassDefFoundError: java/lang/ReflectiveOperationException then you're not running Java 7.
The server is available here
For a complete list of mods, view the announcement in the Voltz forum here
There is NO UPGRADE PATH from previous versions! Don't expect to import your existing worlds, MAKE BACKUPS BEFORE YOU DEPLOY THIS NEW VERSION.