What kind of fees can be expected to be applied when the final application is released? I assume all the critical logic is going to be based on smart contracts, correct?
The initiator of the smart instruments (various procurement and inquiry scenarios) has to sign the contract with his private key to authenticate the deployment. To be able to deploy the smart contract, the initiator (buyer in most cases) has to pay the GAS fee. There is no extra fee charged on top of the blockchain fee required by Ethereum.