According to Dave (@ItsDave_ADA), for Catalyst Fund 15 he will share and support only proposals that enable developers to build and enhance transactions on Cardano using widely used or emerging programming languages, focusing the round on practical developer tooling for the network; source: Dave (@ItsDave_ADA) on X, Oct 7, 2025. According to the same source, priority areas explicitly include on-chain synchronization and querying, framed as key to growing the Cardano ecosystem; source: Dave (@ItsDave_ADA) on X, Oct 7, 2025.