Grafana v4.3 Beta introduces several new features and improvements, including a new Heatmap Panel and support for histograms in the Graph Panel, which enhance data visualization capabilities by allowing users to observe data changes over time with color-coded heatmaps. The update also includes support for Elasticsearch Histogram Aggregations, enabling more precise server-side data bucketing, and introduces an alpha version of a MySQL data source that allows users to write MySQL queries formatted as Time Series or Table Data. Additional updates include a Health Check Endpoint for monitoring Grafana's operational status, a Lazy Load Panels feature to reduce database load, and enhancements to the Prometheus data source for easier data browsing. The release benefits from over 60 small fixes and improvements contributed by the community, reflecting a collaborative effort to enhance the platform's functionality and usability.