Native import is the headline
The Blender 5.3 release notes document Gaussian Splat import from PLY and SPZ, represented as a point-cloud type inside Blender.
Workbench, EEVEE and Cycles can render them
All three render paths are documented as supporting splats, which makes Blender useful for inspection and look-development without immediately converting everything into a traditional mesh.
Do not promise an export pipeline yet
The current Blender 5.3 notes explicitly say there is no Gaussian Splat export support yet. Build tutorials and products around inspection/import/rendering, not a nonexistent one-click round trip.
Performance and transform limitations matter
The release notes warn that performance is not ideal and Apply Transform is not yet correct for the new splat attributes. Early adopters need a test-first workflow.