Every time a mod is updated (stable or not), a new version of N0VA Beta will be released. When the mods are deemed stable enough for regular use, it will be pushed to regular N0VA. This gives you first dibs at new features, (some of the time) at the cost of stability. If you want to add N0VA Beta to your launcher, click Add New Pack and paste in: http://technicpack.net/api/modpack/n0va-beta to use the pack. If you have questions about the new modpack or N0VA, leave a comment. Have fun guys :D
Update: N0VA Beta moves quickly, and we've already included Single Player Commands and Inventory Tweaks! Still waiting on ChickenBones to fix Not Enough Items though.