Nu 3.0 will contain new NuBit products, but it will not contain volume-based fees. This will be done to quicken the development of new products. In addition to the currencies spelled out in motion 5febe97664ed02c8d24dbb444b6a9f43f7a8dea9, another type of currency will be created.
Fixed Supply NuBits (FSN) mirror the supply of their fixed asset. For example, BTC-FSN would never have more than 21 million tokens in existence assuming the BTC code does not change. The practical application of this would be to rapidly distribute the current supply (15 million) then to release additional tokens on a periodic basis to match the inflation rate of BTC. The ultimate distribution mechanisms (auctions) and period between supply adjustments would be determined after creation. The price of FSN NuBits is determined by the free market demand rather than any kind of price fixing mechanism.
BTC-FSN will be added to the list of additional currencies being coded into the core client in Nu 3.0. All blockchain mechanisms for FSN will be the same as price-stable NuBits. FSN creation will still occur as custodial grants to NuBit addresses.
The Nu 3.0 client will also contain a simple procedure (button) to import the private key of one NuBit address to all other NuBit wallets represented by that client.