Stable Diffusion 2.0 has offically been released:

– New Text-to-Image diffusion models (improved quality, 512×512 and 768×768 image sizes by default)
– Super-resolution up-scaler (up to 4x upscaling for 2048×2048+ images)
– Depth-to-Image diffusion model
– Updated Inpainting diffusion model

GitHub
HuggingFace