Google Wallet Plus is a premium version of Google Wallet that allows users to send and receive money with no fees. The marketing plan aims to expand the app's market share worldwide and establish trust among users. Key strategies include targeting the 5 billion mobile payment users, collaborating with Google apps, and offering unique features like requesting and tracking money from others. The plan will implement these strategies through the app's distribution on Google Play, incentives for frequent users, and communication channels for feedback.