NovaCoin client update 0.4.4.6 u4 has been published.
It’s the mandatory update which should be applied before 20 Aug 2014. Database format is compatible with recent 0.4.4.6 builds, so you don’t need to re-syncronize the blockchain.
CoinsDB engine isn’t stable enough for now, so I suppose that 0.4.4.7 branch will be frozen for indefinite time. But its experience will be used in the 0.4.4.6 branch.