Aave V4 will include a number of improvements that could significantly enhance both the protocol's profitability and its appeal to users. One of the key changes is the introduction of a Unified Liquidity Layer, which will allow liquidity from different blockchains to be integrated without the need for migration. This will simplify capital attraction and expand functionality. Additionally, V4 will feature support for cross-chain operations using Chainlink to improve compatibility between different networks, opening up new opportunities for liquidity influx.