Coin Shuffling, a fully decentralized coin mixing, to improve account privacy.

Account Control for phased transactions, the Nxt equivalent of multisignature.

Immediate release of certain types of phased transactions on approval.

Improved block times, 60 s average, long block times now extremely unlikely.

Account Properties, assigning arbitrary name/value metadata to user accounts.

Singleton Assets, useful for representing single tradeable objects.

Dynamic fees, proportional to the relative transaction size.

Improved Exchange Booth UI.

Data Cloud, adding a UI and multiple enhancements to the existing Tagged Data
feature, to allow decentralized, censorship-free and tamper-proof publication
and retrieval of small files, documents, or arbitrary data. This feature is
not dependent on the hard fork and will be fully usable immediately on update
to this release.