Waves will have its own implementation of POS, its own transaction types also its own unique reputation system on the blockchain and many more things. Rewards will be distributed in form of fees, where above full nodes, all lite client end-users will be able to lease their balance and receive rewards also. What you see as of now is only first version of testnet. It is huge project. So above Waves token being the fuel of whole platform, there will be also incentives from the network itself.