MEGA LAUNCH WEEK featured several new features announced by Propel, including Amazon Data Firehose ingestion, a Time Range Picker UI component for React, Segment event ingestion, a Data Grid UI component, and DynamoDB to ClickHouse integration. These features aim to enhance data management, analytics, and user experience. Propel offers a free tier with 10GB of storage and 50,000 queries per month for users to start building.