The 3.8.0 release is a new feature release with the following highlights:

• Add JSONFG read/write vector driver for OGC Features and Geometries JSON.
• Add PMTiles read/write vector driver for PMTiles v3 datasets containing MVT PBF tiles
• Add S102 raster read-only driver for S-102 bathymetric products (depends on libhdf5)
• Add gdal_footprint utility: compute the footprint of a raster file, taking into account nodata/mask band, and generating polygons/multipolygons corresponding to areas where pixels are valid (#6264)
• Python bindings: various enhancements to reduce the number of "gotchas" related to inter-object ownership relationships, and a few syntaxic sugar enhancements
• Arrow interface: improve spatial and attribute filtering on read side; add write side with OGRLayer::WriteArrowBatch()
• GeoPackage: much faster spatial index creation (~ 3-4 times faster)
• ARG driver deprecated: will be removed in 3.9.0

and many other enhancements and fixes as detailed in the release notes