The most recent developments in microscopy generally focus on advanced techniques and applications rather than completely new types. However, one of the significant advancements in recent years is the development of advanced fluorescence microscopy techniques, such as super-resolution microscopy. These methods allow for imaging at resolutions beyond the diffraction limit of light.
Based on the response options provided, if you are looking for a specific answer among the listed types, I would suggest fluorescence microscope as it encompasses some of the latest advancements in imaging technology.